Securities and Exchange Commission
Washington, D.C. 20549
RE:   STERIS Corporation
Commission File No. 0-20165
1933 Act and 1934 Act Filings

Authorized Representatives

Gentlemen:

     The above Company is the issuer of securities registered under Section 12 of the
Securities Exchange Act of 1934. The person signing below confirms, as of the date appearing
opposite his/her signature, that each of the "Authorized Representatives" named below is
authorized on his/her behalf to sign such statements (on Form 3, Form 4, Form 5, Form 144,
Schedule 13G, or otherwise) with respect to securities of the Company (the "Securities"), and to
submit to the Securities and Exchange Commission such filings (including reports, notices, and
other statements) with respect to the Securities, as are required by the Securities Act of 1933 or the
Securities Exchange Act of 1934 (collectively, the "Acts"). The person so signing also confirms the
authority of each of the Authorized Representatives to do and perform, on his/her behalf, any and
all acts and things with respect to the Securities requisite or necessary to assure compliance by the
signing person with the filing requirements of the Acts. The authority confirmed herein shall
remain in effect as to the person signing below until such time as the Commission shall receive
from that person a written communication terminating or modifying the authority.

Authorized Representatives

 Mark D. McGinley
 Michael J. Tokich
 Ronald E. Snyder
 Dennis P. Patton
 J. Adam Zangerle

Dated:  September 7, 2007				By:  /s/ Walter M Rosebrough, Jr.