AMENDMENT TO EMPLOYMENT AGREEMENT
This Amendment (the "Amendment") is made and entered in Chelmsford, Massachusetts by and between
BROOKS AUTOMATION, INC., a Delaware corporation (the "Company") and ROBERT J. THERRIEN
(the "Executive"), as of June 1, 2004 (the "Effective Date").
WHEREAS, the Company and Executive entered into an Employment Agreement dated September 30, 2001,
as amended on July 22, 2002 (the "Employment Agreement") that expires on October 1, 2005; and
WHEREAS, the Company and Executive desire to amend the Employment Agreement as set forth herein to
ensure the Executive's continued employment with the Company and provide for an orderly transition to
Executive's successor as Chief Executive Officer.
NOW, THEREFORE, in consideration of the mutual covenants and promises of the parties, the receipt and
sufficiency of which is hereby acknowledged, the parties hereby agree as follows.
1. Section 1 of the Employment Agreement entitled Duties shall be amended, effective as of October 1, 2004, by
deleting the last three sentences and inserting the following new sentences at the end of that Section:
"Effective as of October 1, 2004 the Executive shall resign from his position as Chief Executive Officer and shall
continue to serve as Chairman of the Company's Board of Directors. Executive shall continue to report to the
Board for the remaining Employment Term (as defined below) and assist with the transition of management duties
and responsibilities to the new Chief Executive Officer."
2. Section 2 of the Employment Agreement entitled Term shall be amended, effective as of October 1, 2004, by
replacing the date October 1, 2005 in the first sentence of that Section with December 31, 2004 and by deleting
the last two sentences of that Section.
3. Section 2 of the Employment Agreement entitled Term shall be amended, effective as of October 1, 2004, by
amending and inserting the following new subsection:
"2.1 Consulting Agreement. The Company and Executive