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Exhibit 24 POWERS OF ATTORNEY The undersigned hereby appoints MARK A. SHELNITZ and DAVID B. SIEGEL as his/her true and lawful attorneys-in-fact for the purpose of signing the registration statement on Form S-8, and all amendments thereto, to be filed by W. R. GRACE & CO., a Delaware corporation ("Company"), with the Securities and Exchange Commission with respect to the Company's 2000 Stock Incentive Plan. Each of such attorneys-in-fact is appointed with full power to act without the other. /s/ John F. Akers /s/ Paul J. Norris ------------------------ ------------------------- John F. Akers Paul J. Norris /s/ Ronald C. Cambre /s/ Robert M. Tarola ------------------------ ------------------------- Ronald C. Cambre Robert M. Tarola /s/ Marye Anne Fox ------------------------ Marye Anne Fox /s/ John J. Murphy Dated: May 10, 2000 ------------------------ John J. Murphy