Exhibit 99.b.


           CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED
            PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002


In connection with the Interim Report of CDI Corp. (the "Company") on Form 10-Q
for the three-month period ending March 31, 2003 as filed with the Securities
and Exchange Commission on the date hereof (the "Report"), the undersigned Chief
Financial Officer of the Company hereby certifies, pursuant to 18 U.S.C.
ss.1350, as adopted pursuant to ss.906 of the Sarbanes-Oxley Act of 2002 that:
1) the Report fully complies with the requirements of Section 13(a) or 15(d) of
the Securities Exchange Act of 1934, and 2) the information contained in the
Report fairly presents, in all material respect, the financial condition and
results of operations of the Company as of and for the periods covered in the
Report.



                                        By:  /s/ Jay G. Stuart
                                             -----------------------------------
                                            Jay G. Stuart
                                            Executive Vice President and
                                            Chief Financial Officer


Dated:  May 8, 2003



A signed original of this written statement required by Section 906 has been
provided to CDI Corp. and will be retained by CDI Corp. and furnished to the
Securities and Exchange Commission or its staff upon request.