Document:

ESCROW AGREEMENT

     ESCROW AGREEMENT ("Agreement") dated [Closing Date] by and among ARPEGGIO
ACQUISITION CORPORATION, a Delaware corporation ("Parent"), IRVIN E. RICHTER, AS
THE TARGET STOCKHOLDERS' REPRESENTATIVE, being the representative of the former
stockholders of HILL INTERNATIONAL, INC., a Delaware corporation (the
"Representative"), and CONTINENTAL STOCK TRANSFER & TRUST COMPANY, as escrow
agent (the "Escrow Agent").

     Parent, Hill International, Inc. ("Target") and the stockholders of Target
are the parties to an Agreement and Plan of Merger and Reorganization dated as
of December 5, 2005 (the "Merger Agreement") pursuant to which Hill has merged
with and into Parent. Pursuant to the Merger Agreement, Parent is to be
indemnified in certain respects. The parties desire to establish an escrow fund
as collateral security for the indemnification obligations under the Merger
Agreement. The Representative has been designated pursuant to the Merger
Agreement to represent all of the former stockholders of Target (the
"Stockholders") and each Permitted Transferee (as hereinafter defined) of the
Stockholders (the Stockholders and all such Permitted Transferees are
hereinafter referred to collectively as the "Owners"), and to act on their
behalf for purposes of this Agreement. Capitalized terms used herein that are
not otherwise defined herein shall have the meanings ascribed to them in the
Merger Agreement.

     The parties agree as follows:

          1. (a) Concurrently with the execution hereof, each of the
Stockholders is delivering to the Escrow Agent, to be held in escrow pursuant to
the terms of this Agreement, stock certificates issued in the name of such
Stockholder representing twelve percent (12%) of the total number of Base Shares
received by such Stockholder pursuant to the Merger Agreement, together with two
(2) assignments separate from certificate executed in blank by such Stockholder,
with medallion signature guaranties. Of such shares, five-sixths (the "Basic
Indemnity Shares") shall be available only with respect to satisfaction of
claims ("Basic Indemnity Claims") for indemnity arising other than pursuant to
Tax Indemnification Claims and one-sixth (the "Tax Indemnity Shares") shall be
available only with respect to satisfaction of Tax Indemnification Claims. The
shares of Parent Common Stock represented by the stock certificates so delivered
by the Stockholders to the Escrow Agent are herein referred to in the aggregate
as the "Escrow Fund." The Escrow Agent shall maintain a separate account for
each Stockholder's, and, subsequent to any transfer permitted pursuant to
Paragraph 1(e) hereof, each Owner's, portion of the Escrow Fund, separately
designated as to Basic Indemnity Shares and Tax Indemnity Shares.

               (b) The Escrow Agent hereby agrees to act as escrow agent and to
hold, safeguard and disburse the Escrow Fund pursuant to the terms and
conditions hereof. It shall treat the Escrow Fund as a trust fund in accordance
with the terms of this Agreement and not as the property of Parent. The Escrow
Agent's duties hereunder shall

terminate upon its distribution of the entire Escrow Fund in accordance with
this Agreement.

               (c) Except as herein provided, the Owners shall retain all of
their rights as stockholders of Parent with respect to shares of Parent Common
Stock constituting the Escrow Fund during the period the Escrow Fund is held by
the Escrow Agent (the "Escrow Period"), including, without limitation, the right
to vote their shares of Parent Common Stock included in the Escrow Fund.

               (d) During the Escrow Period, all dividends payable in cash with
respect to the shares of Parent Common Stock included in the Escrow Fund shall
be paid to the Owners, but all dividends payable in stock or other non-cash
property ("Non-Cash Dividends") shall be delivered to the Escrow Agent to hold
in accordance with the terms hereof. As used herein, the term "Escrow Fund"
shall be deemed to include the Non-Cash Dividends distributed thereon, if any.

               (e) During the Escrow Period, no sale, transfer or other
disposition may be made of any or all of the shares of Parent Common Stock in
the Escrow Fund except (i) to a "Permitted Transferee" (as hereinafter defined),
(ii) by virtue of the laws of descent and distribution upon death of any Owner,
or (iii) pursuant to a qualified domestic relations order; provided, however,
that such permissive transfers may be implemented only upon the respective
transferee's written agreement to be bound by the terms and conditions of this
Agreement. As used in this Agreement, the term "Permitted Transferee" shall
include: (x) members of a Stockholder's "Immediate Family" (as hereinafter
defined); (y) an entity in which (A) a Stockholder and/or members of a
Stockholder's Immediate Family beneficially own 100% of such entity's voting and
non-voting equity securities, or (B) a Stockholder and/or a member of such
Stockholder's Immediate Family is a general partner and in which such
Stockholder and/or members of such Stockholder's Immediate Family beneficially
own 100% of all capital accounts of such entity; and (z) a revocable trust
established by a Stockholder during his lifetime for the benefit of such
Stockholder or for the exclusive benefit of all or any of such Stockholder's
Immediate Family. As used in this Agreement, the term "Immediate Family" means,
with respect to any Stockholder, a spouse, parents, lineal descendants, the
spouse of any lineal descendant, and brothers and sisters (or a trust, all of
whose current beneficiaries are members of an Immediate Family of the
Stockholder). In connection with and as a condition to each permitted transfer,
the Permitted Transferee shall deliver to the Escrow Agent an assignment
separate from certificate executed by the transferring Stockholder, with
medallion signature guaranty, or where applicable, an order of a court of
competent jurisdiction, evidencing the transfer of shares to the Permitted
Transferee, together with two (2) assignments separate from certificate executed
in blank by the Permitted Transferee, with medallion signature guaranties, with
respect to the shares transferred to the Permitted Transferee. Upon receipt of
such documents, the Escrow Agent shall deliver to Parent's transfer agent the
original stock certificate out of which the assigned shares are to be
transferred, together with the executed assignment separate from certificate
executed by the transferring Stockholder, or a copy of the applicable court
order, and shall request that Parent issue new certificates representing (m) the
number of shares, if any, that continue to be owned by the transferring
Stockholder, and (n) the number of shares owned by the Permitted

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Transferee as the result of such transfer. Parent, the transferring Stockholder
and the Permitted Transferee shall cooperate in all respects with the Escrow
Agent in documenting each such transfer and in effectuating the result intended
to be accomplished thereby. During the Escrow Period, no Owner shall pledge or
grant a security interest in such Owner's shares of Parent Common Stock included
in the Escrow Fund or grant a security interest in such Owner's rights under
this Agreement.

          2. (a) Parent, acting through the current or former member or members
of Parent's Board of Directors who has or have been appointed by Parent to take
all necessary actions and make all decisions on behalf of Parent with respect to
its and Target's rights to indemnification under Article VII of the Merger
Agreement (the "Committee"), may make a claim for indemnification pursuant to
the Merger Agreement ("Indemnity Claim") against the Escrow Fund by giving
notice (a "Notice") to the Representative (with a copy to the Escrow Agent)
specifying (i) the covenant, representation, warranty, agreement, undertaking or
obligation contained in the Merger Agreement which it asserts has been breached
or otherwise entitles Parent or Target to indemnification, (ii) in reasonable
detail, the nature and dollar amount of any Indemnity Claim, (iii) whether the
Indemnity Claim is a Basic Indemnity Claim or a Tax Indemnity Claim, and (iv)
whether the Indemnity Claim results from a Third Party Claim against Parent or
Target. The Committee also shall deliver to the Escrow Agent (with a copy to the
Representative), concurrently with its delivery to the Escrow Agent of the
Notice, a certification as to the date on which the Notice was delivered to the
Representative.

               (b) If the Representative shall give a notice to the Committee
(with a copy to the Escrow Agent) (a "Counter Notice"), within 30 days following
the date of receipt (as specified in the Committee's certification) by the
Representative of a copy of the Notice, disputing whether the Indemnity Claim is
indemnifiable under the Merger Agreement, the Committee and the Representative
shall attempt to resolve such dispute by voluntary settlement as provided in
paragraph 2(c) below. If no Counter Notice with respect to an Indemnity Claim is
received by the Escrow Agent from the Representative within such 30-day period,
the Indemnity Claim shall be deemed to be an Established Claim (as hereinafter
defined) for purposes of this Agreement.

               (c) If the Representative delivers a Counter Notice to the Escrow
Agent, the Committee and the Representative shall, during the period of 60 days
following the delivery of such Counter Notice or such greater period of time as
the parties may agree to in writing (with a copy to the Escrow Agent), attempt
to resolve the dispute with respect to which the Counter Notice was given. If
the Committee and the Representative shall reach a settlement with respect to
any such dispute, they shall jointly deliver written notice of such settlement
to the Escrow Agent specifying the terms thereof. If the Committee and the
Representative shall be unable to reach a settlement with respect to a dispute,
such dispute shall be resolved by arbitration pursuant to paragraph 2(d) below.

               (d) If the Committee and the Representative cannot resolve a
dispute prior to expiration of the 60-day period referred to in paragraph 2(c)
above (or such longer period as the parties may have agreed to in writing), then
such dispute shall be

                                        3

submitted (and either party may submit such dispute) for arbitration before a
single arbitrator in New York, New York, in accordance with the commercial
arbitration rules of the American Arbitration Association then in effect and the
provisions of Section 10.12 of the Merger Agreement to the extent that such
provisions do not conflict with the provisions of this paragraph. The Committee
and the Representative shall attempt to agree upon an arbitrator; if they shall
be unable to agree upon an arbitrator within 10 days after the dispute is
submitted for arbitration, then either the Committee or the Representative, upon
written notice to the other, may apply for appointment of such arbitrator by the
American Arbitration Association. Each party shall pay the fees and expenses of
counsel used by it and 50% of the fees and expenses of the arbitrator and of
other expenses of the arbitration. The arbitrator shall render his decision
within 90 days after his appointment and may award costs to either the Committee
or the Representative if, in his sole opinion reasonably exercised, the claims
made by any other party had no reasonable basis and were arbitrary and
capricious. Such decision and award shall be in writing and shall be final and
conclusive on the parties, and counterpart copies thereof shall be delivered to
each of the parties. Judgment may be obtained on the decision of the arbitrator
so rendered in any federal or state court sitting in New York County, New York,
having jurisdiction, and may be enforced in accordance with the law of the State
of New York. If the arbitrator shall fail to render his decision or award within
such 90-day period, either the Committee or the Representative may apply to any
federal or state court sitting in New York County, New York, then having
jurisdiction, by action, proceeding or otherwise, as may be proper to determine
the matter in dispute consistently with the provisions of this Agreement. The
parties consent to the exclusive jurisdiction of the federal and state courts
sitting in New York County, New York, for this purpose. The prevailing party (or
either party, in the case of a decision or award rendered in part for each
party) shall send a copy of the arbitration decision or of any judgment of the
court to the Escrow Agent.

               (e) As used in this Agreement, "Established Claim" means any (i)
Indemnification Claim deemed established pursuant to the last sentence of
paragraph 2(b) above, (ii) Indemnification Claim resolved in favor of Parent or
Target by settlement pursuant to paragraph 2(c) above, resulting in a dollar
award to Parent or Target, (iii) Indemnification Claim established by the
decision of an arbitrator pursuant to paragraph 2(d) above, resulting in a
dollar award to Parent, (iv) Third Party Claim that has been sustained by a
final determination (after exhaustion of any appeals) of a court of competent
jurisdiction, or (v) Third Party Claim that the Committee and the Representative
have jointly notified the Escrow Agent has been settled in accordance with the
provisions of the Merger Agreement.

               (f) (i) Promptly after an Indemnity Claim becomes an Established
Claim, the Committee and the Representative shall jointly deliver a notice to
the Escrow Agent (a "Joint Notice") directing the Escrow Agent to pay to Parent,
and the Escrow Agent promptly shall pay to Parent, an amount equal to the
aggregate dollar amount of the Established Claim (or, if at such time there
remains in the Escrow Fund less than the full amount so payable, the full amount
remaining in the Escrow Fund).

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                    (ii) Payment of an Established Claim shall be made in shares
of Parent Common Stock that are either Basic Indemnity Shares or Tax Indemnity
Shares, as the case may be, pro rata from the account maintained on behalf of
each Owner. For purposes of each payment, such shares shall be valued at the
"Fair Market Value" (as defined below). However, in no event shall the Escrow
Agent be required to calculate Fair Market Value or make a determination of the
number of shares to be delivered to Parent in satisfaction of any Established
Claim; rather, such calculation shall be included in and made part of the Joint
Notice. The Escrow Agent shall transfer to Parent out of the Escrow Fund that
number of shares of Parent Common Stock necessary to satisfy each Established
Claim, as set out in the Joint Notice. Any dispute between the Committee and the
Representative concerning the calculation of Fair Market Value or the number of
shares necessary to satisfy any Established Claim, or any other dispute
regarding a Joint Notice, shall be resolved between the Committee and the
Representative in accordance with the procedures specified in paragraph 2(d)
above, and shall not involve the Escrow Agent. Each transfer of shares in
satisfaction of an Established Claim shall be made by the Escrow Agent
delivering to Parent one or more stock certificates held in each Owner's account
evidencing not less than such Owner's pro rata portion of the aggregate number
of shares specified in the Joint Notice, together with assignments separate from
certificate executed in blank by such Owner and completed by the Escrow Agent in
accordance with instructions included in the Joint Notice. Upon receipt of the
stock certificates and assignments, Parent shall deliver to the Escrow Agent new
certificates representing the number of shares owned by each Owner after such
payment. The parties hereto (other than the Escrow Agent) agree that the
foregoing right to make payments of Established Claims in shares of Parent
Common Stock may be made notwithstanding any other agreements restricting or
limiting the ability of any Owner to sell any shares of Parent stock or
otherwise. The Committee and the Representative shall be required to exercise
utmost good faith in all matters relating to the preparation and delivery of
each Joint Notice. As used herein, "Fair Market Value" means the average
reported closing price for the Parent Common Stock for the ten trading days
ending on the last trading day prior to the day the Established Claim is paid.

                    (iii) Notwithstanding anything herein to the contrary, at
such time as an Indemnification Claim has become an Established Claim, the
Representative shall have the right to substitute for the Escrow Shares that
otherwise would be paid in satisfaction of such claim (the "Claim Shares"), cash
in an amount equal to the Fair Market Value of the Claim Shares ("Substituted
Cash"). In such event (i) the Joint Notice shall include a statement describing
the substitution of Substituted Cash for the Claim Shares, and (ii)
substantially contemporaneously with the delivery of such Joint Notice, the
Representative shall cause currently available funds to be delivered to the
Escrow Agent in an amount equal to the Substituted Cash. Upon receipt of such
Joint Notice and Substituted Cash, the Escrow Agent shall (y) in payment of the
Established Claim described in the Joint Notice, deliver the Substituted Cash to
Parent in lieu of the Claim Shares, and (z) cause the Claim Shares to be
returned to the Representative.

          3. On the first Business Day after the Escrow Termination Date, upon
receipt of a Joint Notice, the Escrow Agent shall distribute and deliver to each
Owner certificates representing the shares of Parent Common Stock then in such
Owner's

                                        5

account in the Escrow Fund that are Basic Indemnity Shares, unless at such time
there are any Basic Indemnity Claims with respect to which Notices have been
received but which have not been resolved pursuant to Section 2 hereof or in
respect of which the Escrow Agent has not been notified of, and received a copy
of, a final determination (after exhaustion of any appeals) by a court of
competent jurisdiction, as the case may be (in either case, "Pending Claims"),
and which, if resolved or finally determined in favor of Parent, would result in
a payment to Parent, in which case the Escrow Agent shall retain, and the total
amount of such distributions to such Owner shall be reduced by, the "Pending
Claims Reserve" (as hereafter defined). The Committee shall certify to the
Escrow Agent the Fair Market Value to be used in calculating the Pending Claims
Reserve and the number of shares of Parent Common Stock to be retained therefor.
Thereafter, if any Pending Claim becomes an Established Claim, the Committee and
the Representative shall deliver to the Escrow Agent a Joint Notice directing
the Escrow Agent to pay to Parent an amount in respect thereof determined in
accordance with paragraph 2(f) above, and to deliver to each Owner shares of
Parent Common Stock then in such owner's account in the Escrow Fund having a
Fair Market Value equal to the amount by which the remaining portion of his
account in the Escrow Fund exceeds the then Pending Claims Reserve (determined
as set forth below), all as specified in a Joint Notice. If any Pending Claim is
resolved against Parent, the Committee and the Representative shall deliver to
the Escrow Agent a Joint Notice directing the Escrow Agent to pay to each Owner
the amount by which the remaining portion of his account in the Escrow Fund
exceeds the then Pending Claims Reserve. Upon resolution of all Pending Claims,
the Committee and the Representative shall deliver to the Escrow Agent a Joint
Notice directing the Escrow Agent shall pay to such Owner the remaining portion
of his or her account in the Escrow Fund.

          On the first Business Day after the Tax Escrow Termination Date, upon
receipt of a Joint Notice, the Escrow Agent shall distribute and deliver to each
Owner certificates representing the shares of Parent Common Stock then in such
Owner's account in the Escrow Fund that are Tax Indemnity Shares and any
remaining Basic Indemnity Shares, regardless of whether or not such Basic
Indemnity Shares are part of the Pending Claims Reserve.

          As used herein, the "Pending Claims Reserve" shall mean, at the time
any such determination is made, that number of shares of Parent Common Stock in
the Escrow Fund having a Fair Market Value equal to the sum of the aggregate
dollar amounts claimed to be due with respect to all Pending Claims (as shown in
the Notices of such Claims).

          4. The Escrow Agent, the Committee and the Representative shall
cooperate in all respects with one another in the calculation of any amounts
determined to be payable to Parent and the Owners in accordance with this
Agreement and in implementing the procedures necessary to effect such payments.

          5. (a) The Escrow Agent undertakes to perform only such duties as are
expressly set forth herein. It is understood that the Escrow Agent is not a
trustee or fiduciary and is acting hereunder merely in a ministerial capacity.

                                        6

               (b) The Escrow Agent shall not be liable for any action taken or
omitted by it in good faith and in the exercise of its own best judgment, and
may rely conclusively and shall be protected in acting upon any order, notice,
demand, certificate, opinion or advice of counsel (including counsel chosen by
the Escrow Agent), statement, instrument, report or other paper or document (not
only as to its due execution and the validity and effectiveness of its
provisions, but also as to the truth and acceptability of any information
therein contained) which is believed by the Escrow Agent to be genuine and to be
signed or presented by the proper person or persons. The Escrow Agent shall not
be bound by any notice or demand, or any waiver, modification, termination or
rescission of this Agreement unless evidenced by a writing delivered to the
Escrow Agent signed by the proper party or parties and, if the duties or rights
of the Escrow Agent are affected, unless it shall have given its prior written
consent thereto.

               (c) The Escrow Agent's sole responsibility upon receipt of any
notice requiring any payment to Parent pursuant to the terms of this Agreement
or, if such notice is disputed by the Committee or the Representative, the
settlement with respect to any such dispute, whether by virtue of joint
resolution, arbitration or determination of a court of competent jurisdiction,
is to pay to Parent the amount specified in such notice, and the Escrow Agent
shall have no duty to determine the validity, authenticity or enforceability of
any specification or certification made in such notice.

               (d) The Escrow Agent shall not be liable for any action taken by
it in good faith and believed by it to be authorized or within the rights or
powers conferred upon it by this Agreement, and may consult with counsel of its
own choice and shall have full and complete authorization and indemnification
under Section 5(g), below, for any action taken or suffered by it hereunder in
good faith and in accordance with the opinion of such counsel.

               (e) The Escrow Agent may resign at any time and be discharged
from its duties as escrow agent hereunder by its giving the other parties hereto
written notice and such resignation shall become effective as hereinafter
provided. Such resignation shall become effective at such time that the Escrow
Agent shall turn over the Escrow Fund to a successor escrow agent appointed
jointly by the Committee and the Representative. If no new escrow agent is so
appointed within the 60 day period following the giving of such notice of
resignation, the Escrow Agent may deposit the Escrow Fund with any court it
reasonably deems appropriate.

               (f) In the event of a dispute between the parties as to the
proper disposition of the Escrow Fund, the Escrow Agent shall be entitled (but
not required) to deliver the Escrow Fund into the United States District Court
for the Southern District of New York and, upon giving notice to the Committee
and the Representative of such action, shall thereupon be relieved of all
further responsibility and liability.

               (g) The Escrow Agent shall be indemnified and held harmless by
Parent from and against any expenses, including counsel fees and disbursements,
or loss suffered by the Escrow Agent in connection with any action, suit or
other proceeding

                                        7

involving any claim which in any way, directly or indirectly, arises out of or
relates to this Agreement, the services of the Escrow Agent hereunder, or the
Escrow Fund held by it hereunder, other than expenses or losses arising from the
gross negligence or willful misconduct of the Escrow Agent. Promptly after the
receipt by the Escrow Agent of notice of any demand or claim or the commencement
of any action, suit or proceeding, the Escrow Agent shall notify the other
parties hereto in writing. In the event of the receipt of such notice, the
Escrow Agent, in its sole discretion, may commence an action in the nature of
interpleader in an appropriate court to determine ownership or disposition of
the Escrow Fund or it may deposit the Escrow Fund with the clerk of any
appropriate court and be relieved of any liability with respect thereto or it
may retain the Escrow Fund pending receipt of a final, non-appealable order of a
court having jurisdiction over all of the parties hereto directing to whom and
under what circumstances the Escrow Fund are to be disbursed and delivered.

               (h) The Escrow Agent shall be entitled to reasonable compensation
from Parent for all services rendered by it hereunder. The Escrow Agent shall
also be entitled to reimbursement from Parent for all expenses paid or incurred
by it in the administration of its duties hereunder including, but not limited
to, all counsel, advisors' and agents' fees and disbursements and all taxes or
other governmental charges.

               (i) From time to time on and after the date hereof, the Committee
and the Representative shall deliver or cause to be delivered to the Escrow
Agent such further documents and instruments and shall do or cause to be done
such further acts as the Escrow Agent shall reasonably request to carry out more
effectively the provisions and purposes of this Agreement, to evidence
compliance herewith or to assure itself that it is protected in acting
hereunder.

               (j) Notwithstanding anything herein to the contrary, the Escrow
Agent shall not be relieved from liability hereunder for its own gross
negligence or its own willful misconduct.

          6. This Agreement expressly sets forth all the duties of the Escrow
Agent with respect to any and all matters pertinent hereto. No implied duties or
obligations shall be read into this Agreement against the Escrow Agent. The
Escrow Agent shall not be bound by the provisions of any agreement among the
parties hereto except this Agreement and shall have no duty to inquire into the
terms and conditions of any agreement made or entered into in connection with
this Agreement, including, without limitation, the Merger Agreement.

          7. This Agreement shall inure to the benefit of and be binding upon
the parties and their respective heirs, successors, assigns and legal
representatives, shall be governed by and construed in accordance with the law
of Delaware applicable to contracts made and to be performed therein except that
issues relating to the rights and obligations of the Escrow Agent shall be
governed by and construed in accordance with the law of New York applicable to
contracts made and to be performed therein. This Agreement cannot be changed or
terminated except by a writing signed by the Committee, the Representative and
the Escrow Agent.

                                        8

          8. The Committee and the Representative each hereby consents to the
exclusive jurisdiction of the federal and state courts sitting in New York
County, New York, with respect to any claim or controversy arising out of this
Agreement. Service of process in any action or proceeding brought against the
Committee or the Representative in respect of any such claim or controversy may
be made upon it by registered mail, postage prepaid, return receipt requested,
at the address specified in Section 9, with copies delivered by nationally
recognized overnight carrier to Graubard Miller, The Chrysler Building, 405
Lexington Avenue, New York, N.Y. 10174-1901, Attention: David Alan Miller, Esq.,
and to McCarter & English, LLP, 245 Park Avenue, 27th Floor, New York, N.Y.
10167, Attention: Peter S. Twombly, Esq.

          9. All notices and other communications under this Agreement shall be
in writing and shall be deemed given if given by hand or delivered by nationally
recognized overnight carrier, or if given by telecopier and confirmed by mail
(registered or certified mail, postage prepaid, return receipt requested), to
the respective parties as follows:

               A.   If to the Committee, to it at:

                    Eric Rosenfeld
                    10 East 53rd Street, 35th Floor
                    New York, New York 10022
                    Telecopier No.: 212-319-0760

                    with a copy to:

                    Graubard Miller
                    The Chrysler Building
                    405 Lexington Avenue
                    New York, New York 10174-1901
                    Attention: David Alan Miller, Esq.
                    Telecopier No.: 212-818-8881

               B.   If to the Representative, to him at:

                    Irvin E. Richter
                    Hill International, Inc.
                    303 Lippincott Centre
                    Marlton, New Jersey 08053
                    Telecopier No.: 856-810-1309

                    with a copy to:

                    McCarter & English, LLP
                    245 Park Avenue, 27th Floor
                    New York, New York 10167

                                        9

                    Attention: Peter S. Twombly, Esq.
                    Telecopier No.: 212-935-1773

               C.   If to the Escrow Agent, to it at:

                    Continental Stock Transfer & Trust Company
                    2 Broadway
                    New York, New York 10004
                    Attention: Steven G. Nelson
                    Telecopier No.: 212-509-5150

or to such other person or address as any of the parties hereto shall specify by
notice in writing to all the other parties hereto.

          10. (a) If this Agreement requires a party to deliver any notice or
other document, and such party refuses to do so, the matter shall be submitted
to arbitration pursuant to paragraph 2(d) of this Agreement.

               (b) All notices delivered to the Escrow Agent shall refer to the
provision of this Agreement under which such notice is being delivered and, if
applicable, shall clearly specify the aggregate dollar amount due and payable to
Parent.

               (c) This Agreement may be executed in any number of counterparts,
each of which shall be deemed to be an original instrument and all of which
together shall constitute a single agreement.

          IN WITNESS WHEREOF, each of the parties hereto has duly executed this
Agreement on the date first above written.

                       [Signatures are on following page]

                                       10

             [Signature Page to Escrow Agreement dated Closing Date]

                                            ARPEGGIO ACQUISITION CORPORATION

                                            By:
                                                --------------------------------
                                            Name:
                                            Title:

                                            THE REPRESENTATIVE

                                            ------------------------------------
                                                      Irvin E. Richter

                                            ESCROW AGENT

                                            CONTINENTAL STOCK TRANSFER &
                                               TRUST COMPANY

                                            By:
                                                --------------------------------
                                            Name: Steven G. Nelson
                                            Title: Chairman

                                       11IRVIN E. RICHTER EMPLOYMENT AGREEMENT

     Employment Agreement (this "Agreement"), dated as of __________, 2006,
among Hill International, Inc., a Delaware corporation (the "Company"), and
Irvin E. Richter ("Executive").

     WHEREAS, the Company desires to be assured of the association and services
of Executive; and

     WHEREAS, Executive is willing and desires to be employed by the Company,
and the Company is willing to employ Executive, upon the terms, covenants and
conditions hereinafter set forth.

     NOW, THEREFORE, in consideration of the mutual terms, covenants and
conditions hereinafter set forth, the parties hereto agree as follows:

     1. EMPLOYMENT. The Company hereby employs Executive, and Executive hereby
accepts such employment, upon the mutual terms, covenants and conditions set
forth herein.

     2. TERM.

     (a) Initial Term. The initial term of this Agreement shall be for a period
of three (3) years commencing on the date hereof, unless terminated earlier
pursuant to Article 6 hereof; provided, however, that Executive's obligations in
Article 5 hereof shall continue in effect after such termination.

     (b) Additional Terms. This Agreement may be extended upon the mutual
consent of Executive and Company.

     3. COMPENSATION; REIMBURSEMENT.

     3.1. Base Salary. For all services rendered by Executive under this
Agreement, the Company shall initially pay Executive a base salary of $850,000
per annum (the "Base Salary"), payable in equal installments twice monthly on
the Company's regular payroll dates.

     3.2. Benefits. In addition to the Base Salary, Executive shall be entitled
to all other benefits of employment provided to other employees of the Company;
provided, however, that during the term of this Agreement Executive shall be
entitled to five (5) weeks of vacation per annum. All health insurance benefits
shall continue at Company's expense after any termination of Executive's
employment by the Company "without cause" for a period of one (1) year from such
termination, except where comparable health insurance is available from a
subsequent employer.

     3.3. Expenses. Executive shall be reimbursed for all reasonable and
approved "out-of-pocket" business expenses for first-class air and rail business
travel and business entertainment incurred in connection with the performance of
his duties under this Agreement. The reimbursement of Executive's business
expenses shall be upon monthly presentation to and approval by the Company of
valid receipts and other appropriate documentation for such expenses.

                                       1

     3.4. Additional Reimbursement. The Company shall pay to, provide or
reimburse Executive during the term hereof the following: (i) all leasing,
maintenance, repair, insurance and fuel costs for one (1) vehicle selected by
Executive in his reasonable discretion, (ii) all mandatory ongoing costs for one
(1) country club membership for Executive, and (iii) all premiums for
Executive's existing life insurance policies.

     4. SCOPE OF DUTIES.

     4.1. Title. Executive's position and title with the Company shall be
Chairman and Chief Executive Officer, or such other position and title as the
Company and Executive may mutually agree upon.

     4.2. Assignment of Duties. Executive shall have such duties as may be
assigned to him from time to time by the Company's Board of Directors
commensurate with his experience and responsibilities in the position for which
he is employed pursuant to Section 4.1 above. Such duties shall be exercised
subject to the control and supervision of the Company's Board of Directors.

     4.3. Location. Executive shall perform his duties out of the Company's
Marlton, N.J. office or at such other location as shall be agreed to by the
Company and Executive.

     4.4. Executive's Devotion of Time. Executive hereby agrees to devote his
full time, abilities and energy to the faithful performance of the duties
assigned to him and to the promotion and forwarding of the business affairs of
the Company, and not to divert any business opportunities from the Company to
himself or to any other person or business entity. Executive hereby agrees to
promote and develop all business opportunities that come to his attention
relating to current or anticipated future business of the Company, in a manner
consistent with the best interests of the Company and with his duties under this
Agreement.

     5. CONFIDENTIALITY; NON-COMPETITION.

     5.1. Confidential Company Information. Other than in the performance of his
duties hereunder, Executive agrees not to disclose, either during the term of
his employment with the Company or at any time thereafter, to any person, firm
or corporation any information concerning the Company which is not in the public
domain including the trade secrets or the customer lists or similar information
of the Company.

     5.2. Ownership of Confidential Company Information; Assignment of Rights.
Executive hereby agrees that all know-how, documents, reports, plans, proposals,
marketing and sales plans, client lists, client files and materials made by him
or by the Company are the property of the Company and shall not be used by him
in any way adverse to the Company's interests. Executive shall not deliver,
reproduce or in any way allow such documents or things to be delivered or used
by any third party without specific direction or consent of the Company.
Executive hereby assigns to the Company any rights that he may have in any such
confidential or proprietary information.

     5.3. Non-Competition. Until one (1) year from the termination of
Executive's employment with the Company, Executive shall not, either directly or
indirectly: (i) serve in any capacity (including as an officer, director,
employee, shareholder or independent consultant) with any competitor of the
Company (provided however that this clause shall not prohibit Executive from
owning less than 5% of any publicly traded competitor of the Company), or (ii)
employ or offer to employ any person then currently employed by the

                                       2

Company. The non-competition covenant contained in this Section 5.3 shall
terminate in the event that the Company shall breach, and fail to cure such
breach within a reasonable period of time, any provision of this Agreement. In
the event that Executive voluntarily resigns from the Company or is terminated
"with cause" during the initial term hereof, this non-competition provision
shall not expire until four (4) years from the date hereof.

     6. TERMINATION.

     6.1. Bases for Termination.

     (a) Executive's employment hereunder may be terminated at any time by
mutual agreement of the parties.

     (b) This Agreement and Executive's employment with the Company shall
automatically terminate on the date on which Executive dies or becomes
permanently incapacitated. "Permanent incapacity" as used herein shall mean
mental or physical incapacity, or both, reasonably determined by the Company
based upon a certification of such incapacity by, in the sole discretion of the
Company, either Executive's regularly attending physician or a duly licensed
physician selected by the Company, rendering Executive unable to perform
substantially all of his or her duties hereunder and which appears reasonably
certain to continue for at least six consecutive months without substantial
improvement. Executive shall be deemed to have "become permanently
incapacitated" on the date 30 days after the Company has determined that
Executive is permanently incapacitated and so notifies Executive.

     (c) Executive's employment may be terminated by the Company "with cause",
effective upon delivery of written notice to Executive given at any time
(without any necessity for prior notice) in the event of any of the following
actions by Executive: (i) conviction of any felony or any other crime involving
moral turpitude, (ii) fraud against the Company or any of its subsidiaries or
affiliates or theft of or maliciously intentional damage to the property of the
Company or any of their subsidiaries or affiliates, (iii) willful breach of
Executive's fiduciary duties to the Company, or (iv) breach by Executive of any
provision of this Agreement; provided, however, that with respect to clause (iv)
above, in order for Executive to be terminated "with cause", the unacceptable
conduct must continue after the Company has given Executive written notice
thereof and a reasonable opportunity to correct such conduct.

     (d) Executive's employment may be terminated by the Company "without
cause", effective upon delivery of written notice to Executive given at any time
(without any necessity for prior notice) provided that the Company complies with
all provisions of this Agreement related to severance, vesting of options and
continuation of benefits as set forth herein.

     (e) Executive may terminate his employment hereunder by giving the Company
no less than 30 days prior written notice of such termination.

     6.2. Payment Upon Termination.

     (a) Upon termination of Executive's employment pursuant to Section 6.1, the
Company shall pay to Executive, within ten days after the effective date of such
termination, an amount equal to Executive's then Base

                                       3

Salary accrued as of such date plus any unreimbursed expenses then owed by the
Company to Executive.

     (b) Upon termination of Executive's employment by the Company without
cause, the Company shall make a lump sum cash payment to Executive within ten
days after the effective date of such termination of an amount equal to the
remaining balance of Executive's Base Salary during the term hereof but in no
event less than one (1) year of Executive's Base Salary. After any such
termination, the Company shall not be obligated to further compensate Executive
nor provide the benefits to Executive described in Article 3 hereof, except as
is required by Sections 3.2 and 3.4 hereof which shall continue for one (1)
year, or as may be required by law.

     (c) Nothing contained in this Section 6.2 shall affect the terms of any
employee stock options that may have been issued by the Company to Executive,
which in the event of termination of Executive's employment with the Company
shall continue to be governed by their own terms and conditions; provided
however that if Executive's employment is terminated by the Company "without
cause", any and all options granted to Executive shall then immediately vest.

     7. MISCELLANEOUS.

     7.1. Transfer and Assignment. This Agreement is personal as to Executive
and shall not be assigned or transferred by Executive. This Agreement shall be
binding upon and inure to the benefit of all of the parties hereto and their
respective permitted heirs, personal representatives, successors and assigns.

     7.2. Severability. Nothing contained herein shall be construed to require
the commission of any act contrary to law. Should there be any conflict between
any provisions hereof and any present or future statute, law, ordinance,
regulation or other pronouncement having the force of law, the latter shall
prevail, but the provision of this Agreement affected thereby shall be curtailed
and limited only to the extent necessary to bring it within the requirements of
the law, and the remaining provisions of this Agreement shall remain in full
force and effect.

     7.3. Governing Law. This Agreement shall be governed by and construed and
interpreted in accordance with the laws of the State of New Jersey.

     7.4. Dispute Resolution. All claims for monetary damages between the
Company and Executive with respect to this Agreement shall be resolved by
binding arbitration, with all proceedings conducted in New Jersey, administered
under the rules and regulations of the American Arbitration Association with the
Federal Rules of Evidence applicable in all respects thereto. Neither the
Company nor Executive shall be limited to arbitration with respect to claims for
equitable relief hereunder.

     7.5. Counterparts. This Agreement may be executed in several counterparts
and all documents so executed shall constitute one agreement, binding on all of
the parties hereto, notwithstanding that all of the parties did not sign the
original or the same counterparts.

     7.6. Entire Agreement. This Agreement constitutes the entire agreement and
understanding of the parties with respect to the subject matter hereof and
supersedes all prior oral or written agreements, arrangements and understandings
with respect thereto. No representation, promise, inducement, statement or
intention has been made by any party hereto that is not embodied herein, and no
party shall be bound by or liable for any alleged

                                       4

representation, promise, inducement, or statement not so set forth herein.

     7.7. Modification. This Agreement may be modified, amended, superseded or
cancelled, and any of the terms, covenants, representations, warranties or
conditions hereof may be waived, only by a written instrument executed by all of
the parties hereto.

     7.8. Attorneys' Fees and Costs. In the event of any dispute arising out of
the subject matter of this Agreement, the prevailing party shall recover, in
addition to any other damages assessed, its attorneys' fees, legal expenses and
court costs incurred in litigating, arbitrating or otherwise attempting to
enforce this Agreement or resolve such dispute. In construing this Agreement, no
party hereto shall have any term or provision construed against such party
solely by reason of such party having drafted or written such term or provision.

     7.9. Waiver. The waiver by either of the parties, express or implied, of
any right under this Agreement or any failure to perform under this Agreement by
the other party, shall not constitute or be deemed as a waiver of any other
right under this Agreement or of any other failure to perform under this
Agreement by the other party, whether of a similar or dissimilar nature.

     7.10. Cumulative Remedies. Each and all of the several rights and remedies
provided in this Agreement, or by law or in equity, shall be cumulative, and no
one of them shall be exclusive of any other right or remedy, and the exercise of
any one of such rights or remedies shall not be deemed a waiver of, or an
election to exercise, any other such right or remedy.

     7.11. Headings. The section and other headings contained in this Agreement
are for reference purposes only and shall not in any way affect the meaning and
interpretation of this Agreement.

     7.12. Notices. Any notice under this Agreement must be in writing and may
be: (i) telecopied, (ii) sent by overnight courier, (iii) hand-delivered, or
(iv) sent by United States mail, to the party to be notified at the following
address:

     If to the Company, to:

          Hill International, Inc.
          303 Lippincott Centre
          Marlton, New Jersey 08053
          Facsimile No.: (856) 810-1309
          Attention: Catherine H. Emma, PHR
                     Vice President and Chief Administrative Officer

          With a copy to:

          Hill International, Inc.
          303 Lippincott Centre
          Marlton, New Jersey 08053
          Facsimile No.: (856) 810-9407
          Attention: William H. Dengler, Jr., Esq.
                     Vice President and General Counsel

                                       5

     If to Executive, to:

          Irvin E. Richter
          54 Fries Lane
          Cherry Hill, New Jersey 08003
          Facsimile No.: (856) 795-5401

Each notice delivered in accordance with this Section 7.12 shall be deemed to be
effective as of the date such notice was sent. Each party may change its address
for notice by giving notice thereof in the manner provided above.

     7.13. Survival. Any provision of this Agreement which imposes an obligation
after termination or expiration of this Agreement shall survive the termination
or expiration of this Agreement and be binding on Executive and the Company.

          IN WITNESS WHEREOF, the parties hereto have caused this Employment
Agreement to be executed under seal as of the date first written above.

Attested to by:              HILL INTERNATIONAL, INC.

                             By:
--------------------------       -----------------------------------------------
William H. Dengler, Jr.          Catherine H. Emma, PHR
Secretary                        Vice President and Chief Administrative Officer

                             --------------------------------------------------
                             IRVIN E. RICHTER

                                       6

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