I am looking for Dr. Stephen (Steven) Seitz in the field of chemistry.
He graduated from University of Pennsylvania in 1981 and did his
graduate work at
Harvard.

Hello.

I assume that you're looking for the Steven P. Seitz who resided in
Philadelphia in 1981 and was mentioned on this chemical patent
application archived by delphion.com:
http://www.delphion.com/details?pn10=US04442099

A chemist with the exact same spelling and middle initial (i.e.,
Steven P. Seitz) is listed as an author of a recent article in the
Journal of Biological Chemistry.  See the abstract on jbc.org:
http://www.jbc.org/cgi/content/abstract/278/30/27820

As indicated, Steven P. Seitz is now with the Pharmaceutical Research
Institute of the Bristol-Myers Squibb Company in New Jersey.  The
address indicated is:

Steven P. Seitz 
Bristol-Myers Squibb
Pharmaceutical Research Institute
Route 206 & Province Line Road
Lawrenceville, NJ 08543


The phone number the for Bristol-Myers Squibb Pharmaceutical Research
Institute (PRI) is 609-252-4000.
Source: biospace.com
http://biospace.com/b2/company_profile.cfm?CompanyID=1319

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search strategy:
chemistry, "seitz steven"
chemistry "steven * seitz"

I hope this helps.