Document:

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                                                                   Exhibit 10.26

                               ESCROW AGREEMENT

     This Escrow Agreement (this "Agreement") is entered into as of April 12,
                                  ---------
2000 by and between Greenwich Technology Partners, Inc., a Delaware corporation
("GTP"), Michael Waresk (the "Stockholder"), and Dunn Lambert, LLC, as Escrow
  ---                         -----------
Agent ("Escrow Agent").
        ------------

                                   RECITALS

     WHEREAS, GTP, the Stockholder and Navigator Technologies, Inc., a New
Jersey corporation ("Navigator"), have entered into an Agreement and Plan of
                     ---------
Merger and Reorganization dated as of April 12, 2000 (the "Merger Agreement"),
                                                           ----------------
pursuant to which Navigator will merge with and into GTP (the "Merger").
                                                               ------
Capitalized terms used in this Agreement and not otherwise defined in this
Agreement shall have the meanings ascribed to them in the Merger Agreement;

     WHEREAS, stock certificates (each a "Stock Certificate") representing an
                                          -----------------
aggregate of 250,000 shares of common stock, $0.01 par value per share, of GTP
(including any dividend or equitable adjustment thereon in the event of a stock
split, stock dividend, stock recombination, recapitalization or like event, the
"Escrow Shares") together with stock transfer powers executed in blank by the
 -------------
Stockholder, shall be deposited into escrow with Escrow Agent and held by Escrow
Agent (such deposits and any future deposits received by Escrow Agent pursuant
to Section 2(d) or any other terms hereof constituting the "Escrow Fund") as
   ------------                                             -----------
collateral for the indemnification obligations of the Stockholder under Article
VIII of the Merger Agreement;

     WHEREAS, the execution and delivery of this Agreement is a condition
precedent to the closing of the transactions contemplated by the Merger
Agreement; and

     WHEREAS, the parties to this Agreement desire to establish the terms and
conditions pursuant to which the Escrow Shares will be deposited into, held in,
and disbursed from, the Escrow Fund.

     NOW, THEREFORE, the parties to this Agreement agree as follows:

     1.   Escrow; Indemnification and Value of Escrow Shares.

     (a)  Escrow Fund.  The Stockholder acknowledges and agrees that (i) the
Escrow Fund has been established and (ii) the Escrow Shares have been deposited
as collateral for the indemnification obligations of the Stockholder under
Article VIII of the Merger Agreement. Escrow Agent agrees to accept delivery of
the Escrow Shares and to hold the Escrow Shares delivered to it in escrow
subject to the terms and conditions of this Agreement.  GTP and the Stockholder
agree that Escrow Agent will hold the Escrow Shares subject to the terms and
conditions set forth herein and as set forth in Article VIII of the Merger
Agreement (collectively, the "Escrow Provisions") until Escrow Agent is required
                              -----------------
to release the Escrow Shares pursuant to the terms of this Agreement.
<PAGE>

     (b)  Indemnification.  The Stockholder agrees that the Escrow Fund shall be
available to compensate GTP for specified Indemnifiable Amounts, as set forth in
the Merger Agreement.  The Stockholder agrees that the Escrow Fund will be held
to satisfy this indemnification obligation to GTP in the manner and in
accordance with the procedures provided in Article VIII of the Merger Agreement.

     (c)  Value of Escrow Shares.  For purposes of this Agreement and the Merger
Agreement, the value of each Escrow Share (the "Escrow Per Share Value") on a
                                                ----------------------
particular date (the "Value Date") shall equal: (i) if GTP's common stock, $.01
par value per share (the "Common Stock") is then traded on a national securities
                          ------------
exchange, the average over the thirty (30) trading days immediately preceding
the Value Date of the closing price on each day for a share of Common Stock on
the principal national securities exchange on which the Common Stock is then
traded; or (ii) if the Common Stock is then traded on the NASDAQ National
market, the average over the thirty (30) trading days immediately preceding the
Value Date of the last reported sale price on each day of the Common Stock on
the NASDAQ National Market; or (iii) if the Common Stock is not then traded on
the NASDAQ National Market, the average over the thirty (30) days trading
immediately preceding the Value Date of each day's closing bid prices last
quoted by an established quotation service for over-the-counter securities; or
(iv) if the Common Stock is not publicly traded, the fair market value of the
Common Stock as determined by GTP's Board of Directors in good faith, after
taking into consideration all factors which it deems appropriate, including,
without limitation, recent sale and offer prices of the Common Stock in private
transactions; provided however,if the Common Stock is not traded on a particular
day, then the closing price, last reported sale price or closing bid price, as
the case may be, shall be the closing price, sale price or closing bid price on
such day that the Common Stock was last traded.

     (d)  Determination of Number of Escrow Shares.  Anytime that GTP is to
receive Escrow Shares under the terms of this Agreement and the Merger
Agreement, the number of Escrow Shares to be delivered to GTP by the Escrow
Agent shall be equal to the Indemnifiable Amounts, or other cost or expense
reimbursement to be satisfied pursuant hereto and thereto, divided by the Escrow
Per Share Value as of such date.  If the calculation herein results in a
fractional number of Escrow Shares, such number of Escrow Shares shall be
rounded, up or down, as the case may be, to the nearest whole number of Escrow
Shares.

     2.   Release From Escrow.

     (a)  Delivery of Escrow Shares.  On the Closing Date, the Escrow Shares and
stock transfer powers executed in blank by the Stockholder shall be deposited
with Escrow Agent into the Escrow Fund.

     (b)  Release to the Stockholder.

                                       2
<PAGE>

          (i)  So long as any portion of the Escrow Fund remains held pursuant
to this Agreement, and provided that the aggregate Indemnifiable Amounts
exceeds or has exceeded $10,000 (exclusive of any breach of Stockholder's
payment obligations under Section 2.5 of the Merger Agreement, for which there
                          -----------
shall be no such threshold), the Escrow Agent shall deliver to GTP that portion
of the Escrow Fund equal in value to the Indemnifiable Amounts, if any, which
have been settled or finally determined between GTP and the Stockholder in
accordance with Section 4 below;

          (ii) subject to Sections 2(c) and 4 below, Escrow Agent shall deliver
to the Stockholder any remaining portion of the Escrow Fund held pursuant to
this Agreement minus (a) an amount equal in value to all Indemnifiable Amounts,
               -----
if any, identified in a Notice of Claim in accordance with Section 3 that have
been settled or finally determined between GTP and the Stockholder on or before
the Cutoff Date in accordance with Section 4 but with respect to which the
Escrow Fund (or a portion thereof) has not, as of that date, been delivered to
GTP hereunder and (b) an amount equal in value to the amount of any and all
unresolved Indemnifiable Amounts, if any, set forth in a Notice of Claim
delivered pursuant to Section 3 below on or prior to the Cutoff Date.  Such
retained portion of the Escrow Fund shall be retained only until the claim for
indemnification pursuant to which such portion is being retained is settled or
finally determined between GTP and the Stockholder in accordance with Section 4
below and upon resolution shall be released in accordance with Section 4 below.

 "Cutoff Date" shall mean the two-year anniversary of the Closing Date.
  -----------

     (c)  Release of Escrow Fund.  The Escrow Fund will be held by Escrow Agent
in accordance with the terms of this Agreement until required to be released
pursuant to Section 2(b).  Within fifteen (15) days after the Cutoff Date,
Escrow Agent will deliver to the Stockholder the requisite portion of the Escrow
Fund to be released on such date.

     (d) No Encumbrance. Neither the Escrow Fund nor any Escrow Shares, nor any
beneficial interest therein, may be pledged, sold, assigned or transferred,
including by operation of law, by the Stockholder or be taken or reached by any
legal or equitable process in satisfaction of any debt or other liability of the
Stockholder (other than pursuant to this Agreement); provided, however, that in
the event a public market exists for the Escrow Shares, the Stockholder may (i)
instruct Escrow Agent to release the Escrow Shares for cash in accordance with
applicable securities laws, the Shareholder Agreement and any agreement between
GTP and the Stockholder or the Stockholder and any third party, provided that
any proceeds from such sale become part of the Escrow Fund to be released in
accordance with the Merger Agreement and this Agreement or (ii) replace the
Escrow Shares with cash in an amount equal to the Escrow Per Share Value times
the number of such Escrow Shares and such cash shall then become subject to the
terms of this Agreement.

     3.   Notice of Claim.

     Each notice of a claim by GTP (the "Notice of Claim") shall be delivered in
                                         ---------------
writing in a certificate signed by an officer of GTP to Escrow Agent and the
Stockholder, and shall contain the following information:

                                       3
<PAGE>

          (i)    GTP's good faith estimate of the reasonably foreseeable amount
     of the claimed Indemnifiable Amount and representation that the aggregate
     Indemnifiable Amounts incurred by GTP exceed U.S.$10,000;

          (ii)   a brief description of the facts, circumstances or events
     giving rise to the claimed amounts based on GTP's good faith belief
     thereof; and

          (iii)  the specific bases upon which indemnification is being sought.

     4.   Resolution of Notice of Claim and Release of Escrow Fund.  Any Notice
of Claim received by the Stockholder pursuant to Section 3 above will be
resolved as follows:

     (a)  Uncontested Claims. In the event that the Stockholder does not contest
a Notice of Claim (or contests only a portion of the claim) in writing to GTP
and Escrow Agent within twenty (20) days after such Notice of Claim is deemed
received by the Indemnification Representative pursuant to Section 6 below,
Escrow Agent will (i) promptly deliver to GTP that portion of the Escrow Fund
equal in value to the amount specified in the Notice of Claim (that is not
contested) by first delivering any available cash in the Escrow Fund and (ii)
notifying the Stockholder of such transfer in writing.

     (b)  Contested Claims.  In the event that the Stockholder gives written
notice to Escrow Agent and GTP contesting all, or a portion of, a Notice of
Claim (a "Contested Claim") within the twenty (20) day period provided above,
          ---------------
Escrow Agent shall not deliver to GTP any of the Escrow Fund with respect to the
contested portion of such Notice of Claim, and the Stockholder and an officer of
GTP shall attempt to resolve the matter.  All disputes regarding the Escrow Fund
under this Agreement shall be settled either by (i) mutual agreement of GTP and
the Stockholder in writing or (ii) by a final ruling by an arbitrator in
accordance with the provisions specified in Section 10(g), a copy of which
                                            -------------
ruling (the "Settlement Documentation") shall be delivered to Escrow Agent, GTP
             ------------------------
and the Stockholder and accompanied by instructions to Escrow Agent, GTP and the
Stockholder to the effect that such ruling is final, that the time for appeal
therefrom has expired (without an appeal having been perfected) and that such
ruling entitles the Stockholder or GTP, as the case may be, to a specified
amount of the Escrow Fund.  Such instructions, in the case of mutual agreement
between the parties, or Settlement Documentation, in the case of a final ruling,
shall constitute written instructions to deliver promptly the number of Escrow
Shares in the Escrow Fund equal in value to the amount of such settled Contested
Claim in accordance with such agreement, judgment, order or decree.  The
balance, if any, of property constituting the Escrow Fund shall be released in
accordance with Section 2(b).

     5.   Incorporation by Reference.  The parties agree that the terms of
Article VIII of the Merger Agreement shall be deemed to be incorporated by
reference in this Agreement as if such Article each had been set forth in its
entirety herein.

     6.   Notices.   All notices, requests, demands or other communications
which are required or may be given pursuant to the terms of this Agreement will
be in writing and will be deemed to have been duly given: (i) on the date of
delivery if personally delivered by hand, (ii) upon the third day after such
notice is deposited in the United States mail, if mailed by registered or
certified mail, postage prepaid, return receipt requested, (iii) upon the date
scheduled for

                                       4
<PAGE>

delivery after such notice is sent by a nationally recognized overnight express
courier or (iv) by fax upon written confirmation (including the automatic
confirmation that is received from the recipient's fax machine) of receipt by
the recipient of such notice:

     If to GTP:               Greenwich Technology Partners, Inc.
     ----------
                              123 Main Street
                              White Plains, New York  10601
                              Attention: Chief Executive Officer

                              With copies to:
                              ---------------
                              Testa, Hurwitz & Thibeault, LLP
                              125 High Street
                              Boston, Massachusetts 02110
                              Attention: Kevin M. Barry, Esq.
                              Fax No.: (617) 248-7100

     If to Navigator:         Navigator Technologies, Inc.
     ----------------
                              628 Route 10 West
                              Suite 3
                              Whippany, NJ 07981
                              Attention:  Chief Executive Officer

                              With copies to:
                              ---------------
                              Dunn Lambert, LLC
                              Mack Centre IV
                              61 S Paramus Road
                              Paramus, NJ 07652
                              Attention:  Richard J. Lambert, Esq.
                              Fax No.: (201) 291-0140

     If to the Stockholder:   Michael Waresk
     ---------------------
                              29 Woodland Road
                              Madison, NJ 07940

                              With copies to:
                              ---------------
                              Dunn Lambert, LLC
                              (address above)

     If to Escrow Agent:      Dunn Lambert, LLC
     ------------------
                              (address above)

     Such addresses may be changed, from time to time, by means of a notice
given in the manner provided in this Section 6.
                                     ---------

     7.   Voting Rights.  In the event of a meeting or written action of
stockholders of GTP during the term of this Agreement, GTP shall send to the
Escrow Agent and to Stockholder

                                       5
<PAGE>

copies of any notices, proxies and proxy material received by it in connection
with such meeting. GTP hereby undertakes to independently furnish copies of all
such notices, proxies and proxy materials directly to the Escrow Agent and the
Stockholder and to cooperate with the Escrow Agent and the Stockholder to
facilitate the exercise by the Stockholder of voting rights in the Escrow
Shares.

     8.   Dividends and Distributions.  GTP shall cause all dividends and other
distributions or rights paid on or granted with respect to the Escrow Shares to
be delivered into the Escrow Fund and such property shall be deemed to be part
of the Escrow Fund held hereunder upon the same terms as the Escrow Shares;
provided, however, that cash dividends on Escrow Shares shall not be added to
--------  -------
the Escrow Fund but shall be distributed promptly to the Stockholder.

     9.   Responsibilities of Escrow Agent.  The acceptance by the Escrow Agent
of its duties under this Agreement is subject to the following terms and
conditions, which the parties to this Agreement hereby agree shall govern and
control with respect to their rights, duties, liabilities and immunities.

          (a)  The Escrow Agent shall act hereunder as depository.

          (b)  The Escrow Agent shall not be liable, except for its own gross
negligence or willful misconduct.

          (c)  The Escrow Agent may consult with, and obtain advice from counsel
in the event of any bona fide question as to any of the provisions hereof or its
duties hereunder, and shall incur no liability and shall be fully protected in
acting in good faith in accordance with the opinion and instructions of such
counsel.

          (d)  The Escrow Agent shall not in any way be bound or affected by any
notice of modification or cancellation of this Agreement unless notice thereof
is given to the Escrow Agent by GTP and Stockholder in accordance with Section 6
                                                                       ---------
hereof, nor shall the Escrow Agent be bound by any modification of its
obligations hereunder unless the same shall be consented to by the Escrow Agent
in writing.  The Escrow Agent shall be entitled to rely upon any judgment,
certification, demand, notice or other writing delivered to it hereunder without
being required to determine the authenticity or the correctness of any fact
stated therein, the propriety or validity of the service thereof, or the
jurisdiction of a court issuing any judgment or order.

          (e)  The Escrow Agent may act in reliance upon any instrument or
signature reasonably believed by it to be genuine, and the Escrow Agent may
assume that any person purporting to give any notice of receipt of advice or
make any statement in connection with the provisions hereof has been duly
authorized to do so.

          (f)  This Agreement sets forth exclusively the duties of the Escrow
Agent with respect to any and all matters pertinent hereto.  Except as otherwise
expressly provided herein, the Escrow Agent shall not refer to, and shall not be
bound by, the provisions of any other agreement.

                                       6
<PAGE>

          (g)  Except with respect to claims based upon the Escrow Agent's
willful misconduct or gross negligence, GTP and Stockholder shall indemnify and
hold harmless the Escrow Agent from and against any claims arising out of or in
connection with this Agreement, such indemnification to include all reasonable
costs and expenses incurred by the Escrow Agent, including but not limited to
reasonable attorneys' fees, and the payment thereof shall be borne fifty percent
(50%) by GTP and fifty percent (50%) by the Stockholder.

          (h)  In the event of any disagreement between the parties to this
Agreement, or between them or any one of them and any other person, resulting in
adverse claims or demands being made in connection with the subject matter of
the escrow, or in the event that the Escrow Agent in good faith is in doubt as
to what action it should take hereunder, the Escrow Agent may, at its option,
refuse to comply with any claims or demands on it, until (i) the rights of all
parties shall have been fully and finally determined by an arbitrator in
accordance with Section 10(g) below or (ii) all differences shall have been
                -------------
adjusted and all doubt resolved by written agreement executed by all parties
hereto.

          (i)  GTP acknowledges that the Escrow Agent is counsel for the
Stockholder and Navigator.  GTP, having conferred with counsel, hereby waives
any right to object to any conflict of interest on the part of Escrow Agent
existing by reason of such fact, whether arising by reason of the performance by
Escrow Agent of its duties hereunder or by reason of its representation of the
Stockholder and Navigator in connection with the Merger Agreement, this
Agreement, any other agreement pursuant hereto or thereto, or in connection with
any dispute between the Stockholder and GTP.

          (j)  The Escrow Agent may be removed by the mutual agreement of GTP
and Stockholder. The Escrow Agent, or any successor Escrow Agent, may resign and
discharge itself of the trust created hereunder, but such resignation shall not
be effective for thirty (30) days after written notice is given to GTP and
Stockholder. Upon the resignation and removal of the Escrow Agent, GTP shall
succeed to the duties of the successor Escrow Agent.

     10.  General.

     (a)  Governing Law.  It is the intention of the parties hereto that the
internal laws of the State of New York shall govern the validity of this
Agreement, the construction of its terms, and the interpretation and enforcement
of the rights and duties of the parties to this Agreement without regard to the
conflict of law rules of such state.

     (b)  Binding Upon Successors and Assigns.  Subject to, and unless otherwise
provided in, this Agreement, each and all of the covenants, terms, provisions,
and agreements contained in this Agreement shall be binding upon, and inure to
the benefit of, the permitted successors, executors, heirs, representatives,
administrators and assigns of the parties to this Agreement.

     (c)  Counterparts.  This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original as against any party
whose signature appears on such counterpart and all of which together shall
constitute one and the same instrument.  This

                                       7
<PAGE>

Agreement shall become binding when one or more counterparts of this Agreement,
individually or taken together, shall bear the signatures of all of the parties
reflected in this Agreement as signatories.

     (d)  Entire Agreement.  Except as set forth in the Merger Agreement, this
Agreement and the documents referenced in this Agreement constitute the entire
understanding and agreement of the parties to this Agreement with respect to the
subject matter of this Agreement and such documents supersede all prior and
contemporaneous agreements or understandings, inducements or conditions, express
or implied, written or oral, between the parties with respect to this Agreement.

     (e)  Waivers.  No waiver by any party to this Agreement of any condition or
of any breach of any provision of this Agreement will be effective unless in
writing.  No waiver by any party of any such condition or breach, in any one
instance, will be deemed to be a further or continuing waiver of any such
condition or breach or a waiver of any other condition or breach of any other
provision contained in this Agreement.

     (f)  Amendment.  This Agreement may be amended with the written consent of
GTP, Escrow Agent and the Stockholder.

     (g)  Arbitration.  GTP, Escrow Agent and the Stockholder agree that any
controversy or claim arising out of, or relating to, this Agreement (including
but not limited to any disagreement over the determination of the value of the
Escrow Shares as provided in clause (iv) of Section 1(c) above) or the breach of
this Agreement will be settled by arbitration by, and in accordance with the
applicable Commercial Arbitration Rules of the American Arbitration Association
and judgment upon the award rendered by the arbitrator(s) may be entered in any
court having jurisdiction. The arbitrator(s) will have the right to assess,
against a party or among the parties, as the arbitrator(s) deem reasonable, (i)
administrative fees of the American Arbitration Association, and (ii)
compensation, if any, to the arbitrator(s). The prevailing party in the
arbitration shall be entitled to recover its reasonable attorneys fees and costs
in the matter from the other party. Arbitration hearings will be held in White
Plains, New York at a mutually acceptable location.

                 [Remainder of Page Left Intentionally Blank.]

                                       8
<PAGE>

     IN WITNESS WHEREOF, the parties have duly executed this Escrow Agreement as
of the day and year first above written.

                              GREENWICH TECHNOLOGY PARTNERS, INC.

                              By: /s/Joseph Beninati
                                  ------------------------------------
                                  Joseph Beninati, President and Chief
                                  Executive Officer

                              STOCKHOLDER:

                              /s/Michael Waresk
                              ----------------------------------------
                               Michael Waresk

                              ESCROW AGENT:

                              DUNN LAMBERT, LLC

                              By: /s/Richard Lambert
                                  ------------------------------------
                                  Name:

                                       9<PAGE>

                                                                   Exhibit 10.27

                                                                  EXECUTION COPY
                                                                  --------------
                               ESCROW AGREEMENT

     This Escrow Agreement (this "Agreement") is entered into as of March 1,
                                  ---------
2000, by and among Greenwich Technology Partners, Inc., a Delaware corporation
("GTP"), John Rothenberger ("J. Rothenberger") and G. Richard Rothenberger ("G.
  ---                        ---------------                                 --
Rothenberger") (J. Rothenberger and G. Rothenberger are sometimes referred to
------------
collectively herein as the "Stockholders").
                            ------------

                                   RECITALS

     WHEREAS, GTP, the Stockholders and Aspire Technology Group, Inc., a
Virginia corporation ("Aspire"), have entered into a Stock Purchase Agreement
                       ------
dated as of March 1, 2000 (the "Purchase Agreement"), pursuant to which GTP will
                                ------------------
purchase from the Stockholders all of the outstanding stock of Aspire (the
"Acquisition").  Capitalized terms used in this Agreement and not otherwise
 -----------
defined in this Agreement shall have the meanings ascribed to them in the
Purchase Agreement;

     WHEREAS, stock certificates (each a "Stock Certificate") representing an
                                          -----------------
aggregate of 177,500 shares of common stock, $0.01 par value per share, of GTP
(including any dividend or equitable adjustment thereon in the event of a stock
split, stock dividend, stock recombination, recapitalization or like event, the
"Escrow Shares"), together with stock transfer powers executed in blank by the
 -------------
Stockholders shall be deposited in escrow with GTP and held by GTP (such deposit
and any future deposits received by GTP pursuant to the terms hereof
constituting the "Escrow Fund") as collateral for the Purchase Price adjustment
                  -----------
provisions of Section 2.03 and the indemnification obligations of the
Stockholders under Section 11.02 of the Purchase Agreement;

     WHEREAS, the execution and delivery of this Agreement is a condition
precedent to the closing of the transactions contemplated by the Purchase
Agreement; and

     WHEREAS, the parties to this Agreement desire to establish the terms and
conditions pursuant to which the Escrow Shares will be deposited into, held in,
and disbursed from, the Escrow Fund.

     NOW, THEREFORE, the parties to this Agreement agree as follows:

     1.   Escrow; Indemnification and Value of Escrow Shares.

     (a)  Escrow Fund.  The Stockholders acknowledge and agree that (i) the
Escrow Fund has been established and (ii) the Escrow Shares deposited by them
have been deposited as collateral for the Purchase Price adjustment provisions
of Section 2.03 and the indemnification obligations of the Stockholders under
Section 11.02 of the Purchase Agreement.  GTP agrees to accept delivery of the
Escrow Shares and to hold the Escrow Shares delivered to it in escrow subject to
the terms and conditions of this Agreement.  GTP and the Stockholders agree that
GTP will hold the Escrow Shares subject to the terms and conditions set forth
herein and as set forth
<PAGE>

in Section 2.03 and Article XI of the Purchase Agreement (collectively, the
"Escrow Provisions") until GTP is required to release the Escrow Shares pursuant
 -----------------
to the terms of this Agreement.

     (b)  Purchase Price Adjustment. The Stockholders agree that the Escrow Fund
shall be available to compensate GTP in the event of an adjustment to the
Purchase Price pursuant to Section 2.03 of the Purchase Agreement. The
Stockholders agree that, subject to the terms hereof, the Escrow Fund will be
used to satisfy this obligation in the manner provided in Section 2.03 of the
Purchase Agreement.

     (c)  Indemnification.  The Stockholders agree that the Escrow Fund also
shall be available to compensate either GTP or Aspire as an Indemnified Party
for specified Damages, as set forth in the Purchase Agreement.  The Stockholders
agree that the Escrow Fund will be held to satisfy this indemnification
obligation to either GTP or Aspire in the manner and in accordance with the
procedures provided in Article XI of the Purchase Agreement.

     (d)  Value of Escrow Shares. For purposes of this Agreement and the
Purchase Agreement, the value of each Escrow Share (the "Escrow Per Share
                                                         ----------------
Value") on a particular date shall equal: (i) if GTP's common stock, $.01 par
-----
value per share (the "Common Stock") is then traded on a national securities
                      ------------
exchange, the average (on the last reported trading day) of the high and low
prices of a share of Common Stock on the principal national securities exchange
on which the Common Stock is then traded; or (ii) if the Common Stock is then
traded on the NASDAQ National market, the last reported sale price of the Common
Stock on the NASDAQ National Market; or (iii) if the Common Stock is not then
traded on the NASDAQ National Market, the average of the closing bid and asked
prices last quoted by an established quotation service for over-the-counter
securities; or (iv) if the Common Stock is not publicly traded, the fair market
value of the Common Stock as determined by GTP's Board of Directors in good
faith, after taking into consideration all factors which it deems appropriate,
including, without limitation, recent sale and offer prices of the Common Stock
in private transactions.

     (e)  Determination of Number of Escrow Shares.  Anytime that GTP is able to
take back Escrow Shares under the terms of this Agreement and the Purchase
Agreement, the number of Escrow Shares to be taken back by GTP shall be equal to
the amount of the Damages, or other cost or expense reimbursement to be
satisfied pursuant hereto and thereto, divided by the Escrow Per Share Value.
If the calculation herein results in a fractional number of Escrow Shares, such
number of Escrow Shares shall be rounded, up or down, as the case may be, to the
nearest whole number of Escrow Shares.

     2.   Release From Escrow.

     (a)  Delivery of Escrow Shares.  On the Closing Date, the Escrow Shares and
stock transfer powers executed in blank by the Stockholders shall be deposited
with GTP into the Escrow Fund.

                                       2
<PAGE>

     (b)  Release to the Stockholders.  Subject to GTP's rights to take back
Escrow Shares or cash in the Escrow Fund pursuant to the Purchase Agreement and
this Agreement, GTP shall deliver to the Stockholders:

     (A) within five (5) business days of either (i) the date upon which GTP
     shall have delivered the certificate required in Section 2.03(a) of the
     Purchase Agreement setting forth its calculation of Retained Earnings if
     such certificate states that no Post-Closing Adjustment is required, (ii)
     the date upon which GTP shall have received the Post-Closing Adjustment
     pursuant to Section 2.03(d) of the Purchase Agreement or (iii) the date
     upon which GTP shall have deducted from the Escrow Fund the amount of such
     Post-Closing Adjustment in accordance with such section (the dates
     described in (i), (ii) and (iii) hereof are referred to collectively herein
     as the "GTP Adjustment Date"), if and only if (x) GTP's Common Stock is
             -------------------    --------------
     then traded on a national securities exchange and (y) on or prior to May
     31, 2000, Aspire shall have paid to GTP in full all amounts due and owing
     pursuant to the Note, a number of Escrow Shares such that the Escrow Shares
     remaining in the Escrow Fund shall equal in value $500,000 determined in
     accordance with Section 1(d) hereof;

     (B) if GTP's Common Stock is not traded on a national securities exchange
     on the GTP Adjustment Date but shall subsequently come to be traded on a
     national securities exchange prior to the one-year anniversary of the
     Closing Date, then within five (5) business days of the date upon which
     such Common Stock is first traded on a national securities exchange, if and
     only if on or prior to May 31, 2000, Aspire shall have paid to GTP in full
     all amounts due and owing pursuant to the Note, a number of Escrow Shares
     such that the Escrow Shares remaining in the Escrow Fund shall equal
     $500,000 (the shares remaining in the Escrow Fund following any
     distribution of Escrow Shares pursuant to Section 2(b)(A) or (2(b)(B) being
     herein called the "Remaining Escrow Fund"); and
                        ---------------------

     (C) on the one-year anniversary of the Closing Date, if there shall have
     been a distribution from the Escrow Fund to the Stockholders pursuant to
     (A) or (B) above, then  an amount in value equal to the Remaining Escrow
     Fund, or, if there shall not have been a distribution from the Escrow Fund
     to the Stockholders pursuant to (A) or (B) above, then 177,500 times the
     Escrow Per Share Value on such date, in either case minus (i) an amount
                                                         -----
     equal in value to the amount of Damages of GTP and Aspire as Indemnified
     Parties, if any, identified in a Notice of Claim that have been settled or
     finally determined between GTP or Aspire and the Stockholders on or before
     the Cutoff Date (as defined below) in accordance with the terms of the
     Purchase Agreement but with respect to which Escrow Shares have not, as of
     that date, been delivered to GTP hereunder and (ii) an amount equal in
     value to the amount of any and all unresolved Damages of GTP and Aspire as
     Indemnified Parties, if any, set forth in a Notice of Claim delivered
     pursuant to the terms of the Purchase Agreement on or prior to the Cutoff
     Date, if such number is a positive number.  Such retained portion of the
     Escrow Fund shall be retained only until the claim for indemnification
     pursuant to which such portion is being retained is settled or finally
     determined between GTP or Aspire and the Stockholders in accordance with
     the

                                       3
<PAGE>

     Purchase Agreement and upon resolution shall be released to the party
     entitled to such Escrow Shares as determined pursuant to the terms of the
     Purchase Agreement (or, if no party shall be entitled thereto pursuant to
     the Purchase Agreement, shall be released to the Stockholders).

 "Cutoff Date" shall mean the one-year anniversary of the Closing Date.
  -----------

     (c)  Release of Escrow Fund.  The Escrow Fund will be held by GTP in
accordance with the terms of this Agreement until required to be released
pursuant to Section 2(b).  Within fifteen (15) days after the Cutoff Date, GTP
will deliver to the Stockholders the requisite portion of the Escrow Fund to be
released on such date.

     (d)  No Encumbrance. Neither the Escrow Fund nor any Escrow Shares, nor any
beneficial interest therein, may be pledged, sold, assigned or transferred,
including by operation of law, by the Stockholders or be taken or reached by any
legal or equitable process in satisfaction of any debt or other liability of the
Stockholders (other than pursuant to this Escrow Agreement); provided, however,
that in the event a public market exists for the Escrow Shares, the Stockholders
and provided further that prior to May, 2000, Aspire shall have paid to GTP in
full all amounts due and owing pursuant to the Note (i) in a writing signed by
both of them, may instruct GTP to sell the Escrow Shares for cash in accordance
with applicable securities laws and any agreement between GTP and the
Stockholders or the Stockholders and any third party, provided that any proceeds
from such sale become part of the Escrow Fund to be released in accordance with
the Purchase Agreement and this Agreement or (ii) may replace the Escrow Shares
with cash in an amount equal to the Escrow Per Share Value times the number of
such Escrow Shares and such cash shall then become subject to the terms of this
Agreement. If cash shall become part of the Escrow Fund, the Stockholders, in a
writing signed by both of them, may direct the investment of such proceeds upon
reasonable advance instruction of the Stockholders to GTP.

     3.   Voting Rights.  In the event of a meeting or written action of
stockholders of GTP during the term of this Agreement, GTP shall send to the
Stockholders copies of any notices, proxies and proxy material received by it in
connection with such meeting.  GTP hereby undertakes to independently furnish
copies of all such notices, proxies and proxy materials directly to the
Stockholders and to cooperate with the Stockholders to facilitate the exercise
by the Stockholders of voting rights in the Escrow Shares.

     4.   Dividends and Distributions.  GTP shall cause all dividends and other
distributions or rights paid on or granted with respect to the Escrow Shares to
be delivered into the Escrow Fund and such property shall be deemed to be part
of the Escrow Fund held hereunder upon the same terms as the Escrow Shares;
provided, however, that cash dividends on Escrow Shares shall not be added to
--------  -------
the Escrow Fund but shall be distributed promptly to the Stockholders.

     5.   Delivery of Escrow Fund.  In the event that it is determined pursuant
to the Purchase Agreement that any portion of the Escrow Fund is owed to either
of GTP or Aspire as

                                       4

<PAGE>

an Indemnified Party hereunder, and such portion includes Escrow Shares, then
GTP will deliver to the Stockholders a notice of such determination and not less
than five (5) days from the date of such notice shall deliver the Stock
Certificate(s) for such Escrow Shares to GTP's transfer agent, accompanied by
instructions (i) to issue a new stock certificate for the number of Escrow
Shares owed to such Indemnified Party in the name of such Indemnified Party and
(ii) to forward such stock certificate to GTP. In the event that the total of
the Escrow Shares represented by the Stock Certificate(s) is greater than the
amount owed to such Indemnified Party, GTP shall cause its transfer agent to
deliver the balance of the Escrow Shares in the form of a stock certificate
(which shall be deemed to be a Stock Certificate for the purposes of this
Agreement from that time forward) into the Escrow Fund. Any portion of the
Escrow Fund which is other than Escrow Shares owed to either of GTP or Aspire as
an Indemnified Party hereunder determined pursuant to the Purchase Agreement
will be taken back promptly by GTP.

     6.   Incorporation by Reference.  The parties agree that the terms of
Section 2.03 and Article XI of the Purchase Agreement shall be deemed to be
incorporated by reference in this Agreement as if such Section and such Article
each had been set forth in its entirety herein.

     7.   Notices.  Any notice provided for or permitted under this Agreement or
the Escrow Provisions will be treated as having been received (a) when delivered
personally, (b) when sent by confirmed telecopy, (c) one (1) day following when
sent by commercial overnight courier with written verification of receipt, or
(d) three (3) business days following when mailed postage prepaid by certified
or registered mail, return receipt requested, to the party to be notified, at
the address set forth below, or at such other place of which the other party has
been notified in accordance with the provisions of this Section 7.

Stockholders:                            John Rothenberger
                                         70 Springvale Road
                                         Great Falls, VA 22066

                                         G. Richard Rothenberger
                                         687 Pony Road
                                         Mohrsville, PA 19541

With a copy to:                          Vernon Johnson, Esq.
                                         Jackson & Campbell, P.C.
                                         One Lafayette Center, South Tower
                                         1120-20/th/ Street, N.W.
                                         Washington, D.C. 20036-3437
                                         Facsimile:  (202) 457-1678

                                       5
<PAGE>

GTP:                                      Greenwich Technology Partners, Inc.
                                          43 Gate House Road
                                          Stamford, CT 06902
                                          Attention:  Chief Executive Officer
                                          Facsimile:  (203) 969-3340

With a copy to:                           Kevin M. Barry, Esq.
                                          Testa, Hurwitz & Thibeault, LLP
                                          125 High Street
                                          Boston, MA 02110
                                          Facsimile: (617) 248-7100

     8.   General.

     (a)  Governing Law.  It is the intention of the parties hereto that the
internal laws of the State of Delaware shall govern the validity of this
Agreement, the construction of its terms, and the interpretation and enforcement
of the rights and duties of the parties to this Agreement without regard to the
conflict of law rules of such state.

     (b)  Binding Upon Successors and Assigns.  Subject to, and unless otherwise
provided in, this Agreement, each and all of the covenants, terms, provisions,
and agreements contained in this Agreement shall be binding upon, and inure to
the benefit of, the permitted successors, executors, heirs, representatives,
administrators and assigns of the parties to this Agreement.

     (c)  Counterparts.  This Agreement may be executed in any number of
counterparts, each of which shall be deemed an original as against any party
whose signature appears on such counterpart and all of which together shall
constitute one and the same instrument.  This Agreement shall become binding
when one or more counterparts of this Agreement, individually or taken together,
shall bear the signatures of all of the parties reflected in this Agreement as
signatories.

     (d)  Entire Agreement.  Except as set forth in the Purchase Agreement, this
Agreement and the documents referenced in this Agreement constitute the entire
understanding and agreement of the parties to this Agreement with respect to the
subject matter of this Agreement and such documents supersede all prior and
contemporaneous agreements or understandings, inducements or conditions, express
or implied, written or oral, between the parties with respect to this Agreement.

     (e)  Waivers.  No waiver by any party to this Agreement of any condition or
of any breach of any provision of this Agreement will be effective unless in
writing.  No waiver by any party of any such condition or breach, in any one
instance, will be deemed to be a further or continuing waiver of any such
condition or breach or a waiver of any other condition or breach of any other
provision contained in this Agreement.

                                       6
<PAGE>

     (f)  Amendment.  This Agreement may be amended with the written consent of
GTP and the Stockholders.

     (g)  Arbitration.  GTP and the Stockholders agree that any controversy or
claim arising out of, or relating to, this Agreement or the breach of this
Agreement will be settled by arbitration by, and in accordance with the
applicable Commercial Arbitration Rules of the American Arbitration Association
and judgment upon the award rendered by the arbitrator(s) may be entered in any
court having jurisdiction.  The arbitrator(s) will have the right to assess,
against a party or among the parties, as the arbitrator(s) deem reasonable, (i)
administrative fees of the American Arbitration Association, and (ii)
compensation, if any, to the arbitrator(s).  Arbitration hearings will be held
in Stamford, Connecticut at a mutually acceptable location.

                                       7
<PAGE>

     IN WITNESS WHEREOF, the parties have duly executed this Escrow Agreement as
of the day and year first above written.

                              GREENWICH TECHNOLOGY PARTNERS, INC.

                              By: /s/ Dennis M. Goett
                                  ---------------------------
                                  Name:
                                  Title:

                              STOCKHOLDERS:

                              /s/John Rothenberger
                              -----------------------------------
                               John Rothenberger

                              /s/G. Richard Rothenberger
                              -----------------------------------
                               G. Richard Rothenberger

                                       8

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