Exhibit 32.1


                            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 Quarterly Report of Life Sciences Research, Inc. (LSR) on
Form 10-Q for the period ended June 30, 2006, as filed with the  Securities  and
Exchange  Commission  on the date  hereof  (the  "Report"),  I, Andrew H. Baker,
Chairman of the Board and Chief Executive Officer of LSR,  certify,  pursuant to
18 U.S.C. Section 1350, as adopted pursuant to Section 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, as amended; and

(2)  The information  contained in the Report fairly  presents,  in all material
     respects, the financial condition and results of operations of LSR.

Date:    August 8, 2006
                                             /s/ Andrew Baker
                                             ------------------------------

                                             Andrew H. Baker
                                             Chairman of the Board
                                             and Chief Executive Officer
                                             (Principal Executive Officer)