Life Sciences Research 10-Q 2007 Q1 Quarterly report

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 March 31, 2007, 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: May 8, 2007

/s/ Andrew Baker

______________________________

Andrew H. Baker

Chairman of the Board

and Chief Executive Officer

(Principal Executive Officer)