<Page>

                                                              EXHIBIT 10(r)


                                 FIRST AMENDMENT
                                       TO
             NON-QUALIFIED SUPPLEMENTAL RETIREMENT BENEFIT AGREEMENT

     This First Amendment made as of March 22, 1999 to the NON-QUALIFIED
SUPPLEMENTAL RETIREMENT BENEFIT AGREEMENT between MICHAEL SHEA (the
"Executive") and the COMPUTER HORIZONS CORP. (the "Company"), dated as of
March 22, 1999 (the "Agreement").


     WHEREAS, the Executive and the Company have previously entered into the
Agreement;

     WHEREAS, the Company and the Executive desire to amend the Agreement in
accordance with Section 12 thereof to provide for immediate vesting and
payment of retirement benefits upon a change of control of the Company.

     NOW THEREFORE, the parties agree to amend the Agreement, effective as of
March 22, 1999 as follows:

     1.  Section 7 of the Agreement is amended by adding the following
paragraph at the end thereof:

         "Notwithstanding the foregoing, the Company may establish
         a "rabbi trust" as described in Rev. Proc. 92-64, 1992-2
         C.B. 422 as promulgated by the Internal Revenue Service
         ("IRS") or any subsequent guidance issued by the IRS,
         whereby trust assets will be held, subject to the claims
         of the Company's creditors in the event of the Company's
         insolvency, until paid to the Participating Employee
         and/or any designated Beneficiary(ies) under the terms of
         this Agreement."

<Page>

     2.  The second sentence of the first paragraph of Section 8 of the
Agreement is amended to read as follows:


         "Except as provided in Section 7 hereof, the
         Participating Employee and/or the designated
         Beneficiary(ies) of the Participating Employee shall have
         the right to receive payments specified under this
         Agreement only from the Company and shall have no right to
         any specific assets of the Company, or any specific or
         special property separate from the Company, to satisfy or
         discharge any claim for benefits."

     3.  Section 11 of the Agreement is amended in its entirety to read as
follows:

         "11.  ACCELERATION OF PAYMENTS. (a) The Company reserves
         the right, in its sole and absolute discretion, to
         accelerate the payment of any benefits payable under this
         Agreement without the consent of the Participating
         Employee, his estate, his designated recipients, or any
         other person claiming through the Participating Employee.

         (b)  Notwithstanding anything else herein, upon the
         occurrence of a Change of Control that occurs prior to the
         date the Participating Employee's employment with the
         Company terminates the Participating Employee shall be
         fully vested in his Retirement Benefit set forth in
         Paragraph 1 of this Agreement and such benefit shall be
         paid to the Participating Employee (or if he dies prior to
         payment, his designated Beneficiary(ies)) within 5 days
         after the date on which the Change of Control occurs.
         Notwithstanding the foregoing, in the event the
         Participating Employee's employment is terminated without
         Cause within ninety (90) days prior to the occurrence of a
         Change of Control, such termination shall, upon occurrence
         of the Change in Control, be deemed to be covered by the
         preceding sentence. For purposes of this Agreement: (i)
         "Change of Control" shall mean: (A) in the case where
         there is an employment agreement in effect between the
         Participating Employee and the Company that defines
         "Change of Control", "Change of Control" as defined under
         such employment agreement, or (B) in the case where there
         is no employment agreement in effect between the
         Participating Employee and the Company, or where there is
         such an employment agreement, but the employment agreement
         does not define "Change of Control", "Change of Control"
         as defined in the Computer Horizons Corp. 1994 Incentive
         Stock Option and Appreciation Plan as in effect on May 4,
         1994" and (ii) "Cause" shall mean: (A) in the case where
         there is an employment agreement in effect between the


                                       2


<Page>

         Participating Employee and the Company that defines
         "Cause", "Cause" as defined in such employment agreement,
         or (B) in the case where there is no employment agreement
         in effect between the Participating Employee and the
         Company, or where there is such an employment agreement
         but the employment agreement does not define "Cause",
         termination due to a Participating Employee's dishonesty,
         fraud, insubordination, willful misconduct, refusal to
         perform services (for any reason other than illness or
         incapacity) or the Participating Employee's unsatisfactory
         performance of his or her duties for the Company.


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


                                       /s/ MICHAEL J. SHEA
                                       --------------------------------
                                       MICHAEL SHEA


                                       COMPUTER HORIZONS CORP.

                                       By:  /s/ WILLIAM J. MURPHY
                                            ----------------------------

                                   3