[LOGO]                                                        15 Elizabeth Drive
BROOKS AUTOMATION                                           Chelmsford, MA 01824
                                                        Telephone:  978-262-2610
                                                              Fax:  978-262-2502
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Robert J. Therrien
President & Chief Executive Officer

May 7, 2002

Dear Mr. ____________________,

I wanted to communicate with you directly on the importance of voting in favor
of Proxy Proposal Number 7. Some of my thoughts were covered in my letter to all
shareholders dated May 2, 2002.

It is all about talent. Employees are the assets that drive shareholder value.
The old economy was tangible asset driven. The new economy often referred to as
the knowledge economy is talent or intangible asset driven. The approximately 3
to 1 ratio of tangible to intangible assets has reversed itself in transitioning
to the knowledge economy. The recruitment and retention of talent, therefore, is
a leading and critical part of the Brooks Automation business model. These
resources are talented, few in number and difficult to find, therefore, they are
expensive and not highly scalable in certain job classifications.

It is well understood that the effect of new products on future earnings growth
is the key; however, we should not understate the importance of establishing a
workforce and a culture that's driven to meet performance goals, schedule and
costs. Maximizing productivity throughout the organization will lead to
maximizing profit. Proposal Number 7 ensures that management is equipped with
the right remuneration tools to successfully follow through on your vote in
favor of this acquisition.

This management team is committed to building shareholder value. In my personal
opinion, we don't manage the profits; we manage the business and it all starts
with our people, their job satisfaction, security and remuneration in its
various forms. Happy employees leads to happy customers leads to happy
shareholders.

The key to understanding our need for your support of management on Proposal
Number 7 is as follows:

     - We will be a bigger company after the acquisition with approximately
       double the number of current employees.

     - Our request covers anticipated needs for the next 2 to 3 years.

     - The PRI options Brooks is assuming does not transfer any authorized but
       ungranted shares.

     - We need the compensation tools to make the merger successful.

I will try to personally call you for further discussion.

Sincerely,

/s/ Robert J. Therrien

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