Exhibit 24 POWER OF ATTORNEY The undersigned hereby appoints KATHLEEN A. BROWNE, LARRY ELLBERGER and ROBERT B. LAMM 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 1997 Stock Plan for Nonemployee Directors. Each of such attorneys-in-fact is appointed with full power to act without the other. /s/J. F. Akers /s/J. W. Frick /s/H. Brown /s/T. A. Holmes /s/C. Cheng /s/V. A. Kamsky /s/A. J. Costello /s/J. J. Murphy /s/H. A. Eckmann /s/J. E. Phipps /s/M. A. Fox /s/T. A. Vanderslice POWER OF ATTORNEY The undersigned hereby appoints ROBERT B. LAMM as his/her true and lawful attorney-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 1997 Stock Plan for Nonemployee Directors. /s/ L. Ellberger /s/ K. A. Browne