Document:

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                                                                 Exhibit 10.12.2
                                                                 ---------------

                               IWO Holdings, Inc.

                      Independent Wireless One Corporation

                            319 Great Oaks Boulevard

                             Albany, New York 12203

                                        September 20, 2000

Mr. Steven M. Nielsen
10 Victoria Lane, Apt. 10
Del Mar, New York 12054

     Re:  Stock Option Agreement, dated as of April 9, 2000 (the "First Stock
          Option Agreement"), between IWO Holdings, Inc. ("Holdings") and you;
          Stock Option Agreement, dated as of September 13, 2000 (the "Second
          Stock Option Agreement"), between Holdings and you; Warrant, dated May
          1, 2000 to Purchase Shares of Class B Common Stock of IWO Holdings,
          Inc. granted to you (the "Warrant"); and Employment Agreement, dated
          as of April 9, 2000 (the "Employment Agreement"), among Holdings,
          Independent Wireless One Corporation ("IWO") and you.

Dear Steve:

     With reference to the above agreements, this letter agreement sets forth
certain understandings reached between Holdings, IWO and you.

     1.  Attached hereto as Exhibit A is a true and correct copy of the First
Stock Option Agreement.  The First Stock Option Agreement shall be amended as
follows:

     (a) Section 1 shall be amended by deleting the definitions of "Approved
Sale," "Daily Vesting" and "Initial Public Offering" and replacing such
definitions with the following definitions:

          '"Approved Sale" means a transaction or a series of related
            -------------
          transactions other than a Designated Merger:  (i) including, but not
          limited to, by way of merger or consolidation, which results in any
          "person" or "group" (as such terms are used in Sections 13(d) and
          14(d) of the Exchange Act or any successor provisions to either of the
          foregoing), other than (A) any one or more of the Initial Stockholders
          or Affiliates thereof or (B)  a non-U.S. entity with respect to which
          an Initial Stockholder or Affiliate thereof has an administrative
          relationship, becoming the "beneficial owner" (as defined in Rule 13d-
          3 under the Exchange Act), directly or indirectly, of a majority of
          the total voting power of the capital stock of Holdings or otherwise
          able to elect a majority of the board of directors of Holdings (for
          purposes of this definition, such person or group shall be deemed to
          beneficially own capital stock of Holdings that is held by any other
          corporation so long as such person or group beneficially owns,
          directly or indirectly, in the aggregate a majority of the total
          capital stock of such other corporation); or (ii) which results in the
          sale, transfer, assignment, lease, conveyance or other disposition,
          directly or
<PAGE>

          indirectly, of all or substantially all the assets of Holdings and its
          subsidiaries, considered as a whole (other than to an Affiliate
          thereof).

          "Daily Vesting" means vesting of the applicable portion of the Option
           --------------
          proportionately for each of the days during the applicable period that
          the Optionee is employed by Holdings such that if Optionee remains
          employed for all of the days during such applicable period such
          applicable portion of the Option shall be vested in full.

          "Initial Public Offering" means the sale of any of the common stock of
           -----------------------
          Holdings or the issuance of common stock of any Person in exchange for
          100% of the capital stock of Holdings pursuant to a registration
          statement that has been declared effective under the Act, if following
          such sale or exchange (i) the issuer is a reporting company under
          Section 12(b) or 12(g) of the Securities Exchange Act of 1934, as
          amended, and (ii) such stock is traded on the New York Stock Exchange
          or the American Stock Exchange, or is quoted on the Nasdaq National
          Market System or is traded or quoted on any other national stock
          exchange or national securities system.

     (b)  Section 1 shall be amended further by adding the following definition:

          "Designated Merger" means a transaction that results in the merger,
           -----------------
          consolidation or amalgamation of Holdings with or into any Person that
          results in the conversion of the outstanding shares of capital stock
          of Holdings into shares of capital stock of such Person (or its
          Affiliate) and such Person (or its Affiliate) has an affiliation with
          Sprint Spectrum L.P. (or its Affiliates) similar to the affiliation
          between IWO and Sprint Spectrum L.P. and its Affiliates (other than
          with respect to the territory covered).

     (c)  Section 3 shall be amended to add the following new clauses (c) and
(d):

          "(c)  Upon the occurrence of an Initial Public Offering, the portion
          of the Performance Vesting Option that is not yet exercisable shall
          cease to vest on the basis of performance and, instead, shall vest on
          the basis of Daily Vesting over a period from January 1 of the year in
          which the closing of the Initial Public Offering occurs through
          December 31, 2002.

          (d)  Notwithstanding Section 3(a) and Section 3(b), upon the
          occurrence of a Designated Merger:

               (i)  the schedule set forth in Section 3(a) shall not apply with
          respect to 20% of the Performance Vesting Options and Time Vesting
          Options that are not yet exercisable (and shall continue to apply to
          the

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<PAGE>

          remaining 80% of such options) and the Optionee shall have the right
          to exercise such 20% of all unexercisable Performance Vesting Options
          and Time Vesting Options; and

               (ii) if Optionee's employment is terminated by Holdings without
          Cause within 12 months following the closing of such Designated
          Merger, then the schedule set forth in Section 3(a) shall not apply
          with respect to the Performance Vesting Options and Time Vesting
          Options that are not yet exercisable and the Optionee shall have the
          right to exercise 100% of all unexercisable Performance Vesting
          Options and Time Vesting Options."

     (d) Section 4(b) shall be amended by deleting such section in its entirety
and replacing such section with the following:

          "(b)  The unexercisable portion of the Time Vesting Option and the
          Performance Vesting Option shall expire on the earlier to occur of (i)
          the Termination Date (giving effect to the vesting of such
          unexercisable portion in accordance with Section 3(d)(ii), if
          applicable), provided that, if prior to an Initial Public Offering, a
          pro rata portion of the portion of the Performance Vesting Option
          scheduled to become exercisable in the year including the Termination
          Date shall become exercisable as if the Optionee's employment had not
          been terminated if performance targets for the Fiscal Year during
          which the Termination Date have been met or exceeded, or (ii) except
          to the extent provided in Section 3(b), Section 3(d) and Section 6(a),
          an Approved Sale or a Designated Merger.  The proration provided for
          in clause (b)(i) above will be determined by the number of days
          elapsed in the year in which the termination occurred before the
          Termination Date.  The Performance Vesting Options that become
          exercisable pursuant to clause (b)(i) above shall expire one year
          following the date on which the Optionee received notice that the
          performance targets were met."

     (e) Section 6(a) shall be amended by deleting such section in its entirety
and replacing such section with the following:

          "(a)  In the event of an Approved Sale or a Designated Merger, the
          unexercised portion of the Option shall terminate upon such Approved
          Sale or Designated Merger unless (i) provision is made in writing in
          connection with such Approved Sale or Designated Merger for the
          assumption of such Options, or for the substitutions of such Options
          of new awards covering the securities of a successor entity or an
          Affiliate thereof, with appropriate adjustments as to the number and
          kind of securities and exercise prices, in which event such
          outstanding Options shall continue or be replaced, as the case may be,
          in the manner and under the terms so provided; or (ii) the Board of
          Directors otherwise shall provide in writing for such adjustments as
          it deems appropriate in the

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<PAGE>

          terms and conditions of the then-outstanding Options, including
          without limitation (A) accelerating the vesting of outstanding Options
          and/or (B) providing for the cancellation of Options and their
          automatic conversion into the right to receive the securities, cash or
          other consideration that a holder of the shares underlying such
          Options would have been entitled to receive upon consummation of such
          Approved Sale or Designated Merger had such shares been issued and
          outstanding immediately prior to the closing date of the Approved Sale
          or Designated Merger (net of the appropriate option exercise prices).
          If pursuant to this Section 6(a) the Options are to terminate upon an
          Approved Sale or Designated Merger without provision for any of the
          actions described in clause (i) or (ii) above, then the Optionee shall
          be given at least ten (10) days' prior notice of the proposed Approved
          Sale or Designated Merger and shall be entitled to exercise such
          exercisable but unexercised portion of the Option (including all
          options that become exercisable immediately prior to the Approved Sale
          pursuant to Section 3(b) or the Designated Merger pursuant to Section
          3(d)(i)) at any time during such ten (10) day period up to and until
          the close of business on the day immediately preceding the date of
          consummation of such Approved Sale or Designated Merger, and,
          notwithstanding Section 7 hereof, the Exercise Price may, at the
          option of the Optionee, be paid in whole or in part by delivery of
          shares of the Class B Common Stock owned by the Optionee (the value of
          such shares delivered as payment of the Exercise Price shall be
          determined based on and consistent with the value of the consideration
          to be tendered in connection with such Approved Sale or Designated
          Merger), and upon exercise of the Option the Option Shares shall be
          treated in the same manner as the shares of any other holder of Class
          B Common Stock."

     2.  Attached hereto as Exhibit B is a true and correct copy of the
Employment Agreement.

     (a)  You agree that in the case of a Panthers Merger (as defined in Section
3(d) hereof), the obligations of the parties under the Employment Agreement with
respect to Section 2(a) thereof will be satisfied if you (i) serve (x) as Chief
Financial Officer or Chief Operating Officer or (y) in a senior staff or
operating position, in either case of the entity ("Parent") issuing shares of
its capital stock in connection with such Panthers Merger, and (ii) perform such
duties as are appropriate to such office and not inconsistent therewith as may
be assigned to you by the board of directors of Parent; provided, that Holdings
or Parent shall have provided to you prior to the closing of such Panthers
Merger a written notice specifying the title, nature and initial duties (which
you understand may change) of such position (the "Position Notice"), and you
shall have until the date occurring 14 days after the date you receive the
Position Notice to reject such position (the "Response Date").

     (b)  (i)  You agree that in the case of Holdings entering into a merger
agreement with respect to a Panthers Merger, and if so requested by Parent after
the closing of such Panthers Merger, you will relocate to a new residence in the
vicinity of the headquarters of Parent no later than the later of July 31, 2001
or the date occurring six months following the

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closing of such Panthers Merger (the period from the date of such request until
such later date, the "Transition Period"). In such event, for the Transition
Period or, if earlier, until the date you acquire a new residence in the
vicinity of Parent, IWO will lease on your behalf an executive residential
quarters in the vicinity of Parent at a cost no greater than $2,500.00 per
month. You shall also be paid or reimbursed for reasonable expenses incurred by
you in commuting to and from such quarters to your existing residence or
quarters, as the case may be, in the vicinity of Holdings no more frequently
than weekly during the Transition Period or, if earlier, until the date you
acquire a new residence in the vicinity of Parent. In addition, in the case of
Holdings entering into such merger agreement, you agree to enter into the
Transition Relocation Expense Agreement attached as Exhibit C, pursuant to which
IWO will provide to you approximately $100,000 of relocation money subject to
the terms and conditions contained therein.

     (ii) Notwithstanding Section 2(b)(i), you may, at your option, relocate to
a new residence in the vicinity of the headquarters of Parent at any time after
Holdings enters into a merger agreement with respect to a Panthers Merger, in
which case this Section 2(b)(ii) shall apply instead of Section 2(b)(i), and the
"Transition Period" shall be the period from the date you provide written notice
to Holdings of the exercise of your option (the "Option Notice") until the date
occurring 15 days after the closing of such Panthers Merger.  In such event, for
the Transition Period or, if longer, for 120 days after the date of the Option
Notice, but in either case no later than the date you acquire a new residence in
the vicinity of Parent, IWO will lease on your behalf an executive residential
quarters in the vicinity of Parent at a cost no greater than $2,500.00 per
month.  In addition, for the Transition Period, IWO will lease on your behalf an
executive residential quarters in the vicinity of Holdings at a cost no greater
than $2,500.00 per month.  You shall also be paid or reimbursed for reasonable
expenses incurred by you in commuting to and from such quarters to your
residence or quarters, as the case may be, in the vicinity of Parent no more
frequently than weekly during the Transition Period.  In addition, in the case
of Holdings entering into such merger agreement, you agree to enter into the
Transition Relocation Expense Agreement attached as Exhibit C, pursuant to which
IWO will provide to you approximately $100,000 of relocation money subject to
the terms and conditions contained therein.

     (c) You agree that in the case that Holdings enters into a merger agreement
with respect to a Panthers Merger, the closing of such Panthers Merger does not
occur for any reason and you have relocated to a new residence in the vicinity
of the headquarters of Parent pursuant to Section 2(b) hereof, you will relocate
to a residence in the vicinity of the headquarters of Holdings no later than
July 31, 2001 (the "Re-Transition Period").  In such event, for the Re-
Transition Period or, if earlier, until the date you acquire a new residence in
the vicinity of Holdings, IWO will lease on your behalf an executive residential
quarters at a cost no greater than $2,500.00 per month.  You shall also be paid
or reimbursed for reasonable expenses incurred by you in commuting to and from
such quarters to your existing home in the vicinity of Parent no more frequently
than weekly during the Re-Transition Period, and you agree to enter into the Re-
Transition Relocation Expense Agreement attached as Exhibit D, pursuant to which
IWO will provide to you approximately $100,000 of relocation money subject to
the terms and conditions contained therein.

     3.  Attached hereto as Exhibit E is a true and correct copy of the Warrant.
Such Warrant shall be amended as follows:

                                       5
<PAGE>

     (a)  The words "or Panthers Merger" shall be inserted at the end of the
parenthetical clause in the heading thereof (appearing below the legend);

     (b)  The words "or upon a Panthers Merger" shall be added to the end of the
first sentence in the first full paragraph following the heading thereof;

     (c)  Section 1 shall be amended by deleting the definition of "Approved
Sale" and replacing such definition with the following definition:

          '"Approved Sale" means a transaction or a series of related
            -------------
          transactions other than a Panthers Merger:  (i) including, but not
          limited to, by way of merger or consolidation, which results in any
          "person" or "group" (as such terms are used in Sections 13(d) and
          14(d) of the Exchange Act or any successor provisions to either of the
          foregoing), other than (A) any one or more of the Initial Stockholders
          or Affiliates thereof or (B)  a non-U.S. entity with respect to which
          an Initial Stockholder or Affiliate thereof has an administrative
          relationship, becoming the "beneficial owner" (as defined in Rule 13d-
          3 under the Exchange Act), directly or indirectly, of a majority of
          the total voting power of the capital stock of Holdings or otherwise
          able to elect a majority of the board of directors of Holdings (for
          purposes of this definition, such person or group shall be deemed to
          beneficially own capital stock of Holdings that is held by any other
          corporation so long as such person or group beneficially owns,
          directly or indirectly, in the aggregate a majority of the total
          capital stock of such other corporation); or (ii) which results in the
          sale, transfer, assignment, lease, conveyance or other disposition,
          directly or indirectly, of all or substantially all the assets of
          Holdings and its subsidiaries, considered as a whole (other than to an
          Affiliate thereof).

     (d)  Section 1 shall be amended further by adding the following definition:

          "Panthers Merger" means a transaction that (i) results in the merger,
           ---------------
          consolidation or amalgamation or other business combination of
          Holdings with or into an entity referred to by Holdings as "Panthers,"
          or the sale, transfer, assignment, lease, conveyance or other
          disposition, directly or indirectly, of all or substantially all the
          assets of Holdings and its subsidiaries, considered as a whole, to
          Panthers, and (ii) closes prior to March 31, 2001.

     (e)  Section 2(a)(ii) shall be amended to delete the "or" at the end of
Section 2(a)(ii).

     (f)  Section 2(a)(iii) shall be amended to replace the "." at the end of
Section 2(a)(iii) with "; or".

     (g)  Section 2(a) shall be amended to add the following new clause (iv):

          "(iv)  immediately prior to the closing of a Panthers Merger."

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     (h)  Section 2(b)(ii) shall be amended to delete the "or" at the end of
Section 2(b)(ii).

     (i)  Section 2(b)(iii) shall be amended to replace the "." at the end of
Section 2(b)(iii) with "; or".

     (j)  Section 2(b) shall be amended to add the following new clause (iv):

          "(iv)  immediately prior to the closing of a Panthers Merger."

     (k)  Section 2(c) shall be amended by deleting such section in its entirety
and replacing such section with the following:

          "(c)  Holdings shall give to the Holder written notice (the "Holdings
                                                                       --------
          Notice") of the occurrence of an Approved Sale or a Panthers Merger at
          ------
          least 20 days prior to the anticipated closing of such Approved Sale
          or Panthers Merger or an Initial Investors Cash-Out within 100 days
          following such Initial Investors Cash-Out."

     (l)  Section 2(f) shall be amended by deleting such section in its entirety
and replacing such section with the following:

          "(f)  (i) If the Holdings Notice is with respect to a Panthers Merger,
          the Holder shall notify Holdings on or before five days prior to the
          anticipated closing date of such Panthers Merger of such Holder's
          exercise; (ii) with respect to an Approved Sale, if the Holdings
          Notice states that Holdings anticipates that such event will cause the
          vesting of the 40% IRR Warrant or the 60% IRR Warrant, the Holder
          shall notify Holdings on or before five days prior to the anticipated
          closing date of such Approved Sale of such Holder's exercise; and
          (iii) with respect to an Initial Investors Cash-Out, if the Holdings
          Notice states that such event has caused the vesting of either of such
          warrants, the Holder shall notify Holdings on or before five days
          following receipt of the Holdings Notice of such Holder's exercise of
          this Warrant (the "Notice Date") .  This Warrant shall be exercisable
                             -----------
          by the Holder in whole only, and not in part, by the surrender of this
          Warrant and delivery to Holdings on or before the Notice Date of (i) a
          duly executed notice of exercise in the form of Exhibit A (a "Notice
                                                                        ------
          of Exercise") and (ii) at the option of the Holder, either (A) the
          -----------
          Exercise Price for the Warrant Shares, payable in cash or by wire
          transfer to a bank account designated by Holdings or (B) in the case
          of a Panthers Merger, a notice by Holder to Holdings requesting the
          Warrant Shares be issued net of the appropriate Exercise Price (to be
          determined based on and consistent with the value of the consideration
          to be tendered in connection with such Panthers Merger)."

     (m)  Section 2(g) shall be amended by deleting such section in its entirety
and replacing such section with the following:

                                       7
<PAGE>

          "(g)  This Warrant shall terminate automatically upon the closing of
          an Approved Sale or a Panthers Merger and this Warrant shall no longer
          be of any force or effect, unless (i) provision is made in writing in
          connection with such transaction for the continuance of this Warrant
          and for the assumption of this Warrant, or for the substitution for
          this Warrant of a new Warrant covering the securities of a successor
          entity or an affiliate thereof, with appropriate adjustments as to the
          number and kind of securities and exercise price, in which event this
          Warrant shall continue or be replaced, as the case may be, in the
          manner and under the terms so provided; or (ii) the Board of Directors
          of Holdings shall provide in writing for such adjustment as it deems
          appropriate in terms and conditions of this Warrant, including without
          limitation (A) accelerating the vesting of this Warrant and/or (B)
          providing for the cancellation of this Warrant and its automatic
          conversion into the right to receive the securities, cash or other
          consideration that the Holder would have been entitled to receive upon
          consummation of such Approved Sale or Panthers Merger had Warrant
          Shares been issued and outstanding immediately prior to the Approved
          Sale or Panthers Merger (net of the appropriate exercise price)."

     4.   Attached hereto as Exhibit F is a true and correct copy of the Second
Stock Option Agreement.

     5.   Notwithstanding anything herein to the contrary, if you reject
pursuant to Section 2(a)(ii) hereof the position specified in the Position
Notice, you may at your election have the following provisions (a) through (f)
become effective upon your notifying Holdings and IWO of such election in the
form set forth as Exhibit G hereto (the "Election Notice") at any time after the
date you receive the Position Notice but in no event later than the Response
Date. Neither any election by you under this Section 5 nor any other provision
of this Section 5 shall be effective if you have not timely provided such
notice.

     (a)  The Employment Agreement shall be terminated as of the date of the
Election Notice and, notwithstanding any other provision thereof to the contrary
and in satisfaction of Holdings' and IWO's obligations thereunder, you shall be
entitled to the rights provided by the first sentence of Sections 3(b) and 7(d)
thereof with your bonus compensation for fiscal 2000 being determined as if your
employment had continued through December 31, 2000, but in any case such bonus
compensation for fiscal 2000 shall not be less than 50% of the maximum bonuses
that you would have received under Section 3(b) of the Employment Agreement if
the goals described therein had been met for fiscal 2000.  In addition, on the
Separation Date (defined below), you shall be entitled to receive $225,000 as a
severance payment.

     (b)  For the period from the date of the Election Notice through a date (to
be determined by the board of directors of Holdings) up to six months following
the date of the Election Notice (the "Separation Date"), you will provide all
reasonable and necessary assistance to Parent, Holdings and IWO (as directed by
the board of directors of Holdings) in order to ensure the orderly transition of
your duties and responsibilities for Holdings and IWO.  You will be paid for
such services a fee equal to six months' of your basic salary as determined
pursuant to

                                       8
<PAGE>

Section 3(a) of the Employment Agreement and will be entitled to participate in
medical, dental and car allowance benefits as if your employment had continued
for six months following the date of the Election Notice. Following such six
month period, you will be entitled to elect to continue medical and dental
coverage in accordance with Section 601 et. seq. of the Employee Retirement
Income Security Act of 1974. You will also be paid or reimbursed for all
reasonable business travel and other business expenses incurred or paid by you
on or prior to the Separation Date in connection with the performance of your
services upon presentation of expense statements or vouchers and any such other
supporting information as Holdings may request.

     (c)  Notwithstanding Section 1 hereof, with respect to the First Stock
Option Agreement:

          (i)  an Approved Sale shall be deemed to have occurred as of the date
     of the consummation of such Panthers Merger, and all Options which are the
     subject of such agreement shall vest and be exercisable immediately prior
     to the consummation of such Panthers Merger; and

          (ii) subject to Section 6(a) of such agreement, your Options will
     expire on the later of five years after the Termination Date or two years
     after an Initial Public Offering.

     (d)  With respect to the Second Stock Option Agreement:

          (i)  an Approved Sale shall be deemed to have occurred as of the date
     of the consummation of such Panthers Merger, and all Options which are the
     subject of such agreement shall vest and be exercisable immediately prior
     to the consummation of such Panthers Merger; and

          (ii) subject to Section 6(a) of such agreement, your Options will
     expire on the later of five years after the Termination Date or two years
     after an Initial Public Offering.

     (e)  The Warrant shall be further amended as set forth in clauses (i)
through (v) below and shall vest and be exercisable in accordance with the terms
of the Warrant as amended by Section 3 hereof:

          (i)   the words "or Termination of Employment" shall be deleted from
     the parenthetical clause in the heading thereof;

          (ii)  the words "or in the event of the termination of Holder's
     employment with Holdings or any of its Subsidiaries" shall be deleted from
     the first full paragraph following the heading thereof;

          (iii) the definitions "Termination of Employment," "Cause,"
     "Disability" and "Retirement" contained in Section 1 thereof shall be
     deleted in their entirety;

          (iv)  the words ", provided such occurrence is prior to the
     Termination of Employment" shall be deleted from the first sentence in each
     of Sections 2(a) and 2(b) thereof; and

                                       9
<PAGE>

          (v)   Section 2(h) shall be deleted in its entirety.

     (f)  You, for yourself, your agents, legal representatives, assigns, heirs,
distributees, devisees, legatees, administrators, personal representatives and
executors ("Your Parties"), on the one hand, and Holdings and IWO, its present,
            ------------
past and future subsidiaries and affiliates, successors and assigns, and their
respective present and past officers, directors, employees and agents ("Our
                                                                        ---
Parties"), on the other hand hereby release and forever discharge the other,
-------
from any and all claims, demands, actions, liabilities and other claims for
relief and remuneration whatsoever, whether known or unknown; provided, however,
that nothing contained herein shall relieve IWO, Holdings or you from any
obligation arising herein, under the agreements referenced herein (as modified
by this agreement), under the Indemnity Agreement dated December 20, 1999
between Holdings and you, under the Certificate of Incorporation of Holdings or
IWO or under the Stockholders Agreement dated December 20, 1999 between
Holdings, you and the other parties thereto.  Your Parties and Our Parties
further agree not to assert any claim, charge or other legal proceeding against
the other, in any forum, based on any events, whether known or unknown, which
are the subject of the release contained in this Section 5(f).

     6.   Except for the changes described herein, the First Stock Option
Agreement, the Second Stock Option Agreement, the Warrant and the Employment
Agreement will be unchanged and remain in full force and effect.

     7.   In connection with a Designated Merger if and when requested by the
board of directors of Holdings, you agree to enter into a lockup agreement and a
voting agreement with respect to your shares of capital stock of Holdings and
Parent and any such capital stock that may be acquired upon the exercise of
options or warrants for such capital stock, to the extent and on substantially
the same basis as Investcorp S.A. and its subsidiaries enter into such
agreements with respect to their capital stock of Holdings and Parent.

     8.   You hereby waive any acceleration of benefits pursuant to the First
Stock Option Agreement, the Second Stock Option Agreement or the Warrant unless
shareholder approval meeting the requirements of Section 280G(b)(5) of the
Internal Revenue Code of 1986, as amended (the "Code"), with respect to such
benefits is obtained.

     9.   You agree that this letter agreement (excluding for this purpose
paragraph 8 of such agreement) shall not be effective unless shareholder
approval meeting the requirements of Section 280G(b)(5) of the Code is obtained.

     10.  This letter agreement shall inure to the benefit of, and be binding
upon, the heirs, executors, administrators, successors and assigns of you,
Holdings and/or IWO.

     11.  The parties hereto agree to take or cause to be taken all such further
actions as may be reasonably necessary or appropriate to effectuate the intent,
purposes and obligations of this letter agreement.

                                       10
<PAGE>

     Please indicate your acceptance of the terms hereof by signing in the
appropriate space below.

                              Very truly yours,

                              IWO HOLDINGS, INC.

                              By: /s/ Solon L. Kandel
                                  -------------------
                                 Name:  Solon L. Kandel
                                 Title:  President and Chief Executive Officer

                              INDEPENDENT WIRELESS ONE CORPORATION

                              By: /s/ Solon L. Kandel
                                 --------------------
                                 Name:  Solon L. Kandel
                                 Title:  President and Chief Executive Officer

Agreed and accepted:

Steven M. Nielsen

/s/ Steven M. Nielsen
---------------------<PAGE>

                                                                 Exhibit 10.13.2
                                                                 ---------------

                               IWO Holdings, Inc.
                      Independent Wireless One Corporation
                            319 Great Oaks Boulevard
                             Albany, New York 12203

                              September 1, 2000

Mr. David Standig
22 Gullane Drive
Slingerlands, New York 12159

     Re:  Stock Option Agreement, dated as of December 20, 1999 (the "First
          Stock Option Agreement"), between IWO Holdings, Inc. ("Holdings") and
          you; Stock Option Agreement, dated as of March 20, 2000 (the "Second
          Stock Option Agreement"), between Holdings and you; Warrant, dated
          December 20, 1999, to Purchase Shares of Class B Common Stock of IWO
          Holdings, Inc. granted to you (the "Warrant"); Employment Agreement,
          dated as of December 20, 1999 (the "Employment Agreement"), as
          amended, among Holdings, Independent Wireless One Corporation ("IWO")
          and you; Management Bonus Stock Purchase Agreement, dated as of
          December 20, 1999 (the "Bonus Stock Purchase Agreement"), among you,
          Holdings and IWO Holdings Limited; Management Stock Purchase
          Agreement, dated as of March 20, 2000 (the "Stock Purchase
          Agreement"), among you, Holdings and Investcorp IWO Limited
          Partnership.

Dear David:

     With reference to the above agreements, this letter agreement sets forth
certain understandings reached between Holdings, IWO and you.

     1.  Attached hereto as Exhibit A is a true and correct copy of the First
Stock Option Agreement.  Such First Stock Option Agreement shall be amended as
follows:

     (a) Section 1 shall be amended by deleting the definitions of "Approved
Sale," "Daily Vesting" and "Initial Public Offering" and replacing such
definitions with the following definitions:

         "Approved Sale" means a transaction or a series of related
          -------------
          transactions other than a Designated Merger:  (i) including, but not
          limited to, by way of merger or consolidation, which results in any
          "person" or "group" (as such terms are used in Sections 13(d) and
          14(d) of the Exchange Act or any successor provisions to either of the
          foregoing), other than (A) any one or more of the Initial Stockholders
          or Affiliates thereof or (B)  a non-U.S. entity with respect to which
          an Initial Stockholder or Affiliate thereof has an administrative
          relationship, becoming the "beneficial owner" (as defined in Rule 13d-
          3 under the Exchange Act), directly or indirectly, of a majority of
          the total voting power of the capital stock of Holdings or
<PAGE>

          otherwise able to elect a majority of the board of directors of
          Holdings (for purposes of this definition, such person or group shall
          be deemed to beneficially own capital stock of Holdings that is held
          by any other corporation so long as such person or group beneficially
          owns, directly or indirectly, in the aggregate a majority of the total
          capital stock of such other corporation); or (ii) which results in the
          sale, transfer, assignment, lease, conveyance or other disposition,
          directly or indirectly, of all or substantially all the assets of
          Holdings and its subsidiaries, considered as a whole (other than to an
          Affiliate thereof).

          "Daily Vesting" means vesting of the applicable portion of the Option
           --------------
          proportionately for each of the days during the applicable period that
          the Optionee is employed by Holdings such that if Optionee remains
          employed for all of the days during such applicable period such
          applicable portion of the Option shall be vested in full.

          "Initial Public Offering" means the sale of any of the common stock of
           -----------------------
          Holdings or the issuance of common stock of any Person in exchange for
          100% of the capital stock of Holdings pursuant to a registration
          statement that has been declared effective under the Act, if following
          such sale or exchange (i) the issuer is a reporting company under
          Section 12(b) or 12(g) of the Securities Exchange Act of 1934, as
          amended, and (ii) such stock is traded on the New York Stock Exchange
          or the American Stock Exchange, or is quoted on the Nasdaq National
          Market System or is traded or quoted on any other national stock
          exchange or national securities system.

     (b)  Section 1 shall be amended further by adding the following definition:

          "Designated Merger" means a transaction that results in the merger,
           -----------------
          consolidation or amalgamation of Holdings with or into any Person that
          results in the conversion of the outstanding shares of capital stock
          of Holdings into shares of capital stock of such Person (or its
          Affiliate) and such Person (or its Affiliate) has an affiliation with
          Sprint Spectrum L.P (or its Affiliates) similar to the affiliation
          between IWO and Sprint Spectrum L.P and its Affiliates (other than
          with respect to the territory covered).

     (c)  Section 3 shall be amended to add the following new clauses (c) and
          (d):

          "(c)  Upon the occurrence of an Initial Public Offering, the portion
          of the Performance Vesting Option that is not yet exercisable shall
          cease to vest on the basis of performance and, instead, shall vest on
          the basis of Daily Vesting over a period from January 1 of the year in
          which the closing of the Initial Public Offering occurs through
          December 31, 2002.

                                       2
<PAGE>

          (d)  Notwithstanding Section 3(a) and Section 3(b), upon the
          occurrence of a Designated Merger:

               (i) the schedule set forth in Section 3(a) shall not apply with
          respect to 20% of the Performance Vesting Options and Time Vesting
          Options that are not yet exercisable (and shall continue to apply to
          the remaining 80% of such options) and the Optionee shall have the
          right to exercise such 20% of all unexercisable Performance Vesting
          Options and Time Vesting Options; and

               (ii) if Optionee's employment is terminated by Holdings without
          Cause within 12 months following the closing of such Designated
          Merger, then the schedule set forth in Section 3(a) shall not apply
          with respect to the Performance Vesting Options and Time Vesting
          Options that are not yet exercisable and the Optionee shall have the
          right to exercise 100% of all unexercisable Performance Vesting
          Options and Time Vesting Options."

     (d)  Section 4 (b) shall be amended by deleting such section in its
entirety and replacing such section with the following:

          "(b)  The unexercisable portion of the Time Vesting Option and the
          Performance Vesting Option shall expire on the earlier to occur of (i)
          the Termination Date (giving effect to the vesting of such
          unexercisable portion in accordance with Section 3(d)(ii), if
          applicable), provided that, if prior to an Initial Public Offering, a
          pro rata portion of the portion of the Performance Vesting Option
          scheduled to become exercisable in the year including the Termination
          Date shall become exercisable as if the Optionee's employment had not
          been terminated if performance targets for the Fiscal Year during
          which the Termination Date have been met or exceeded, or (ii) except
          to the extent provided in Section 3(b), Section 3(d) and Section 6(a),
          an Approved Sale or a Designated Merger.  The proration provided for
          in clause (b)(i) above will be determined by the number of days
          elapsed in the year in which the termination occurred before the
          Termination Date.  The Performance Vesting Options that become
          exercisable pursuant to clause (b)(i) above shall expire one year
          following the date on which the Optionee received notice that the
          performance targets were met."

     (e)  Section 6(a) shall be amended by deleting such section in its entirety
and replacing such section with the following:

          "(a)  In the event of an Approved Sale or a Designated Merger, the
          unexercised portion of the Option shall terminate upon such Approved
          Sale or Designated Merger unless (i) provision is made in writing in
          connection with such Approved Sale or Designated Merger for the
          assumption of such Options, or for the substitutions of such Options
          of

                                       3
<PAGE>

          new awards covering the securities of a successor entity or an
          Affiliate thereof, with appropriate adjustments as to the number and
          kind of securities and exercise prices, in which event such
          outstanding Options shall continue or be replaced, as the case may be,
          in the manner and under the terms so provided; or (ii) the Board of
          Directors otherwise shall provide in writing for such adjustments as
          it deems appropriate in the terms and conditions of the then-
          outstanding Options, including without limitation (A) accelerating the
          vesting of outstanding Options and/or (B) providing for the
          cancellation of Options and their automatic conversion into the right
          to receive the securities, cash or other consideration that a holder
          of the shares underlying such Options would have been entitled to
          receive upon consummation of such Approved Sale or Designated Merger
          had such shares been issued and outstanding immediately prior to the
          closing date of the Approved Sale or Designated Merger (net of the
          appropriate option exercise prices). If pursuant to this Section 6(a)
          the Options are to terminate upon an Approved Sale or Designated
          Merger without provision for any of the actions described in clause
          (i) or (ii) above, then the Optionee shall be given at least ten (10)
          days' prior notice of the proposed Approved Sale or Designated Merger
          and shall be entitled to exercise such exercisable but unexercised
          portion of the Option (including all options that become exercisable
          immediately prior to the Approved Sale pursuant to Section 3(b) or the
          Designated Merger pursuant to Section 3(d)(i)) at any time during such
          ten (10) day period up to and until the close of business on the day
          immediately preceding the date of consummation of such Approved Sale
          or Designated Merger, and, notwithstanding Section 7 hereof, the
          Exercise Price may, at the option of the Optionee, be paid in whole or
          in part by delivery of shares of the Class B Common Stock owned by the
          Optionee (the value of such shares delivered as payment of the
          Exercise Price shall be determined based on and consistent with the
          value of the consideration to be tendered in connection with such
          Approved Sale or Designated Merger), and upon exercise of the Option
          the Option Shares shall be treated in the same manner as the shares of
          any other holder of Class B Common Stock."

     2.   Attached hereto as Exhibit B is a true and correct copy of the Second
Stock Option Agreement.  Such Second Stock Option Agreement shall be amended as
follows:

     (a) Section 1 shall be amended by deleting the definitions of "Approved
Sale" and "Initial Public Offering" and replacing such definitions with the
following definitions:

          "Approved Sale" means a transaction or a series of related
           -------------
          transactions other than a Designated Merger:  (i) including, but not
          limited to, by way of merger or consolidation, which results in any
          "person" or "group" (as such terms are used in Sections 13(d) and
          14(d) of the Exchange Act or any successor provisions to either of the
          foregoing), other than (A) any one or more of the Initial Stockholders
          or Affiliates thereof or (B)  a non-U.S. entity with respect to which
          an Initial Stockholder or Affiliate thereof

                                       4
<PAGE>

          has an administrative relationship, becoming the "beneficial owner"
          (as defined in Rule 13d- 3 under the Exchange Act), directly or
          indirectly, of a majority of the total voting power of the capital
          stock of Holdings or otherwise able to elect a majority of the board
          of directors of Holdings (for purposes of this definition, such person
          or group shall be deemed to beneficially own capital stock of Holdings
          that is held by any other corporation so long as such person or group
          beneficially owns, directly or indirectly, in the aggregate a majority
          of the total capital stock of such other corporation); or (ii) which
          results in the sale, transfer, assignment, lease, conveyance or other
          disposition, directly or indirectly, of all or substantially all the
          assets of Holdings and its subsidiaries, considered as a whole (other
          than to an Affiliate thereof).

          "Initial Public Offering" means the sale of any of the common stock of
           -----------------------
          Holdings or the issuance of common stock of any Person in exchange for
          100% of the capital stock of Holdings pursuant to a registration
          statement that has been declared effective under the Act, if following
          such sale or exchange (i) the issuer is a reporting company under
          Section 12(b) or 12(g) of the Securities Exchange Act of 1934, as
          amended, and (ii) such stock is traded on the New York Stock Exchange
          or the American Stock Exchange, or is quoted on the Nasdaq National
          Market System or is traded or quoted on any other national stock
          exchange or national securities system.

     (b)  Section 1 shall be amended further by adding the following definition:

          "Designated Merger" means a transaction that results in the merger,
           -----------------
          consolidation or amalgamation of Holdings with or into any Person that
          results in the conversion of the outstanding shares of capital stock
          of Holdings into shares of capital stock of such Person (or its
          Affiliate) and such Person (or its Affiliate) has an affiliation with
          Sprint Spectrum L.P (or its Affiliates) similar to the affiliation
          between IWO and Sprint Spectrum L.P and its Affiliates (other than
          with respect to the territory covered).

     (c)  Section 6(a) shall be amended by deleting such section in its entirety
and replacing such section with the following:

          "(a)  In the event of an Approved Sale or a Designated Merger, the
          unexercised portion of the Option shall terminate upon such Approved
          Sale or Designated Merger unless (i) provision is made in writing in
          connection with such Approved Sale or Designated Merger for the
          assumption of such Options, or for the substitutions of such Options
          of new awards covering the securities of a successor entity or an
          Affiliate thereof, with appropriate adjustments as to the number and
          kind of securities and exercise prices, in which event such
          outstanding Options shall continue or be replaced, as the case may be,
          in the manner and under

                                       5
<PAGE>

          the terms so provided; or (ii) the Board of Directors otherwise shall
          provide in writing for such adjustments as it deems appropriate in the
          terms and conditions of the then- outstanding Options, including
          providing for the cancellation of Options and their automatic
          conversion into the right to receive the securities, cash or other
          consideration that a holder of the shares underlying such Options
          would have been entitled to receive upon consummation of such Approved
          Sale or Designated Merger had such shares been issued and outstanding
          immediately prior to the closing date of the Approved Sale or
          Designated Merger (net of the appropriate option exercise prices). If
          pursuant to this Section 6(a) the Options are to terminate upon an
          Approved Sale or Designated Merger without provision for any of the
          actions described in clause (i) or (ii) above, then the Optionee shall
          be given at least ten (10) days' prior notice of the proposed Approved
          Sale or Designated Merger and shall be entitled to exercise such
          exercisable but unexercised portion of the Option at any time during
          such ten (10) day period up to and until the close of business on the
          day immediately preceding the date of consummation of such Approved
          Sale or Designated Merger, and, notwithstanding Section 7 hereof, the
          Exercise Price may, at the option of the Optionee, be paid in whole or
          in part by delivery of shares of the Class B Common Stock owned by the
          Optionee (the value of such shares delivered as payment of the
          Exercise Price shall be determined based on and consistent with the
          value of the consideration to be tendered in connection with such
          Approved Sale or Designated Merger), and upon exercise of the Option
          the Option Shares shall be treated in the same manner as the shares of
          any other holder of Class B Common Stock."

     3.  Attached hereto as Exhibit C is a true and correct copy of the
Employment Agreement.  You agree that in the case of a Designated Merger (as
defined in Section 1(b) hereof), the obligations of the parties under the
Employment Agreement with respect to Section 2 thereof will be satisfied if you
perform such duties and in such capacity or capacities as are commensurate with
your existing duties and capacities solely with respect to the current territory
covered by the business of IWO irrespective of the title you shall have after
such Designated Merger, or as otherwise agreed to between you and Holdings or
its successor in such Designated Merger.

     4.  Attached hereto as Exhibit D is a true and correct copy of the Warrant.
Such Warrant shall be amended as follows:

     (a) The words "or Panthers Merger" shall be inserted at the end of the
parenthetical clause in the heading thereof (appearing below the legend);

     (b) The words "or upon a Panthers Merger" shall be added to the end of the
first sentence in the first full paragraph following the heading thereof;

     (c) Section 1 shall be amended by deleting the definition of "Approved
Sale" and replacing such definition with the following definition:

                                       6
<PAGE>

          "Approved Sale" means a transaction or a series of related
            -------------
          transactions other than a Panthers Merger:  (i) including, but not
          limited to, by way of merger or consolidation, which results in any
          "person" or "group" (as such terms are used in Sections 13(d) and
          14(d) of the Exchange Act or any successor provisions to either of the
          foregoing), other than (A) any one or more of the Initial Stockholders
          or Affiliates thereof or (B)  a non-U.S. entity with respect to which
          an Initial Stockholder or Affiliate thereof has an administrative
          relationship, becoming the "beneficial owner" (as defined in Rule 13d-
          3 under the Exchange Act), directly or indirectly, of a majority of
          the total voting power of the capital stock of Holdings or otherwise
          able to elect a majority of the board of directors of Holdings (for
          purposes of this definition, such person or group shall be deemed to
          beneficially own capital stock of Holdings that is held by any other
          corporation so long as such person or group beneficially owns,
          directly or indirectly, in the aggregate a majority of the total
          capital stock of such other corporation); or (ii) which results in the
          sale, transfer, assignment, lease, conveyance or other disposition,
          directly or indirectly, of all or substantially all the assets of
          Holdings and its subsidiaries, considered as a whole (other than to an
          Affiliate thereof).

     (d)  Section 1 shall be amended further by adding the following definition:

          "Panthers Merger" means a transaction that (i) results in the merger,
           ---------------
          consolidation or amalgamation or other business combination of
          Holdings with or into an entity referred to by Holdings as "Panthers,"
          or the sale, transfer, assignment, lease, conveyance or other
          disposition, directly or indirectly, of all or substantially all the
          assets of Holdings and its subsidiaries, considered as a whole, to
          Panthers, and (ii) closes prior to March 31, 2001.

     (e)  Section 2(a)(ii) shall be amended to delete the "or" at the end of
Section 2(a)(ii).

     (f) Section 2(a)(iii) shall be amended to replace the "." at the end of
Section 2(a)(iii) with "; or".

     (g) Section 2(a) shall be amended to add the following new clause (iv):

          "(iv)  immediately prior to the closing of a Panthers Merger."

     (h) Section 2(b)(ii) shall be amended to delete the "or" at the end of
Section 2(b)(ii).

     (i) Section 2(b)(iii) shall be amended to replace the "." at the end of
Section 2(b)(iii) with "; or".

     (j) Section 2(b) shall be amended to add the following new clause (iv):

          "(iv)  immediately prior to the closing of a Panthers Merger."

                                       7
<PAGE>

     (k)  Section 2(c) shall be amended by deleting such section in its entirety
and replacing such section with the following:

          "(c)  Holdings shall give to the Holder written notice (the "Holdings
                                                                       --------
          Notice") of the occurrence of an Approved Sale or a Panthers Merger at
          ------
          least 20 days prior to the anticipated closing of such Approved Sale
          or Panthers Merger or an Initial Investors Cash-Out within 100 days
          following such Initial Investors Cash-Out."

     (l)  Section 2(f) shall be amended by deleting such section in its entirety
and replacing such section with the following:

          "(f)  (i) If the Holdings Notice is with respect to a Panthers Merger,
          the Holder shall notify Holdings on or before five days prior to the
          anticipated closing date of such Panthers Merger of such Holder's
          exercise; (ii) with respect to an Approved Sale, if the Holdings
          Notice states that Holdings anticipates that such event will cause the
          vesting of the 40% IRR Warrant or the 60% IRR Warrant, the Holder
          shall notify Holdings on or before five days prior to the anticipated
          closing date of such Approved Sale of such Holder's exercise; and
          (iii) with respect to an Initial Investors Cash-Out, if the Holdings
          Notice states that such event has caused the vesting of either of such
          warrants, the Holder shall notify Holdings on or before five days
          following receipt of the Holdings Notice of such Holder's exercise of
          this Warrant (the "Notice Date") .  This Warrant shall be exercisable
                             -----------
          by the Holder in whole only, and not in part, by the surrender of this
          Warrant and delivery to Holdings on or before the Notice Date of (i) a
          duly executed notice of exercise in the form of Exhibit A (a "Notice
                                                                        ------
          of Exercise") and (ii) at the option of the Holder, either (A) the
          -----------
          Exercise Price for the Warrant Shares, payable in cash or by wire
          transfer to a bank account designated by Holdings or (B) in the case
          of a Panthers Merger, a notice by Holder to Holdings requesting the
          Warrant Shares be issued net of the appropriate Exercise Price (to be
          determined based on and consistent with the value of the consideration
          to be tendered in connection with such Panthers Merger)."

     (m) Section 2(g) shall be amended by deleting such section in its entirety
and replacing such section with the following:

          "(g)  This Warrant shall terminate automatically upon the closing of
          an Approved Sale or a Panthers Merger and this Warrant shall no longer
          be of any force or effect, unless (i) provision is made in writing in
          connection with such transaction for the continuance of this Warrant
          and for the assumption of this Warrant, or for the substitution for
          this Warrant of a new Warrant covering the securities of a successor
          entity or an affiliate thereof, with appropriate adjustments as to the
          number and kind of securities and exercise price, in which event this
          Warrant shall continue or be replaced, as the case may be, in the
          manner and under the terms so

                                       8
<PAGE>

          provided; or (ii) the Board of Directors of Holdings shall provide in
          writing for such adjustment as it deems appropriate in terms and
          conditions of this Warrant, including without limitation (A)
          accelerating the vesting of this Warrant and/or (B) providing for the
          cancellation of this Warrant and its automatic conversion into the
          right to receive the securities, cash or other consideration that the
          Holder would have been entitled to receive upon consummation of such
          Approved Sale or Panthers Merger had Warrant Shares been issued and
          outstanding immediately prior to the Approved Sale or Panthers Merger
          (net of the appropriate exercise price)."

     5.  Attached hereto as Exhibit E is a true and correct copy of the Bonus
Stock Purchase Agreement.  Attached hereto as Exhibit F is a true and correct
copy of the Stock Purchase Agreement.  Upon the occurrence of a Panthers Merger
(as defined in Section 4(d) hereof):

     (a) with respect to the Bonus Stock Purchase Agreement, Holdings hereby
waives any Repurchase Right (as defined therein) that it may have pursuant to
Section 3(a) thereof and you hereby waive any Put Right (as defined therein)
that you may have pursuant to Section 3(b) thereof; and

     (b) with respect to the Stock Purchase Agreement, Holdings hereby waives
any Repurchase Right (as defined therein) that it may have pursuant to Section
3(a) thereof and you hereby waive any Put Right (as defined therein) that you
may have pursuant to Section 3(b) thereof.

     6.  Except for the changes described herein, the First Stock Option
Agreement, the Second Stock Option Agreement, the Warrant, the Employment
Agreement, the Bonus Stock Purchase Agreement and the Stock Purchase Agreement
will be unchanged and remain in full force and effect.

     7.  In connection with a Designated Merger if and when requested by the
board of directors of Holdings, you agree to enter into a lockup agreement and a
voting agreement with respect to your shares of capital stock of Holdings and
Parent and any such capital stock that may be acquired upon the exercise of
options or warrants for such capital stock, to the extent and on substantially
the same basis as Investcorp S.A. and its subsidiaries enter into such
agreements with respect to their capital stock of Holdings and Parent.

     8.  You hereby waive any acceleration of benefits pursuant to the First
Stock Option Agreement, the Second Stock Option Agreement, the Warrant, the
Bonus Stock Purchase Agreement or the Stock Purchase Agreement unless
shareholder approval meeting the requirements of Section 280G(b)(5) of the
Internal Revenue Code of 1986, as amended (the "Code"), with respect to such
benefits is obtained.

     9.  You agree that this letter agreement (excluding for this purpose
paragraph 8 of such agreement) shall not be effective unless shareholder
approval meeting the requirements of Section 280G(b)(5) of the Code is obtained.

                                       9
<PAGE>

     10.  This letter agreement shall inure to the benefit of, and be binding
upon, the heirs, executors, administrators, successors and assigns of you,
Holdings and/or IWO.

     11.  The parties hereto agree to take or cause to be taken all such further
actions as may be reasonably necessary or appropriate to effectuate the intent,
purposes and obligations of this letter agreement.

                                      10
<PAGE>

     Please indicate your acceptance of the terms hereof by signing in the
appropriate space below.

                              Very truly yours,

                              IWO HOLDINGS, INC.

                              By: /s/ Solon L. Kandel
                                 --------------------
                                 Name:  Solon L. Kandel
                                 Title:  President and Chief Executive Officer

                              INDEPENDENT WIRELESS ONE CORPORATION

                              By: /s/ Solon L. Kandel
                                 --------------------
                                 Name:  Solon L. Kandel
                                 Title:  President and Chief Executive Officer

Agreed and accepted:

David Standig

/s/ David L. Standig
--------------------

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