JOINT FILING AGREEMENT

                                                                       EXHIBIT B

                             JOINT FILING AGREEMENT

               The undersigned hereby agree that the statement on Schedule 13D
dated April 3, 1998 with respect to the Common Stock, par value $0.01 per
share, of ICF Xxxxxx International, Inc. is, and any amendments thereto signed
by each of the undersigned shall be, filed on behalf of each of us pursuant to
and in accordance with the provisions of Rule 13d-1(f) under the Securities
Exchange Act of 1934.

               This Agreement may be executed in counterparts, each of which
shall for all purposes be deemed to be an original and all of which shall
constitute one and the same instrument.


Dated:  April 3, 1998

                                              XXXXX & COMPANY

                                              By: COWEN INCORPORATED
                                                  Its General Partner


                                                  By: /s/ Xxxxx Xxxxx
                                                      ----------------
                                                      Xxxxx Xxxxx
                                                      Managing Director


                                              COWEN INCORPORATED
 

                                                  By: /s/ Xxxxx Xxxxx
                                                      ----------------
                                                      Xxxxx Xxxxx
                                                      Managing Director



                                              /s/ Xxxxxx X. Xxxxx
                                              -------------------
                                              Xxxxxx X. Xxxxx