Exhibit 24.1
POWER OF ATTORNEY
The undersigned Officers and Directors of Ionics, Incorporated hereby severally constitute Arthur L. Goldstein, Stephen Korn and each of them to sign for and in their names in the capacities indicated below, the Registration Statement on Form S-8 dated May 29, 2003, herewith filed with the Securities and Exchange Commission, and any and all amendments thereto, for the purpose of registering shares of Common Stock, par value $1.00 per share, of Ionics, Incorporated, hereby ratifying and confirming our signatures as they may be signed by our said attorneys to said Registration Statement and any and all amendments to said Registration Statement.
Witness our hands and common seal on the dates set forth below.
Signature Title Date
Chairman of the Board and
Chief Executive Officer
(Principal Executive Officer)
/s/ Arthur L. Goldstein and Director May 29, 2003
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Arthur L. Goldstein
/s/ Douglas R. Brown Director May 29, 2003
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Douglas R. Brown
/s/ Stephen L. Brown Director May 29, 2003
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Stephen L. Brown
/s/ Kathleen F. Feldstein Director May 29, 2003
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Kathleen F. Feldstein
/s/ William K. Reilly Director May 29, 2003
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William K. Reilly
/s/ John J. Shields Director May 29, 2003
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John J. Shields
/s/ Daniel I. C. Wang Director May 29, 2003
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Daniel I. C. Wang
/s/ Mark S. Wrighton Director May 29, 2003
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Mark S. Wrighton
/s/ Allen S. Wyett Director May 29, 2003
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Allen S. Wyett