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Exhibit 24.1

The undersigned hereby appoints THOMAS E. BLASER, MARK A. SHELNITZ, and MICHAEL W. CONRON 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 (the “Corporation”), with the Securities and Exchange Commission with respect to the Corporation's 2018 Stock Incentive Plan and all amendments thereto. Each of such attorneys-in-fact is appointed with full power to act without the other.

R. F. Cummings, Jr.		/s/ R. F. Cummings, Jr.
J. Fasone Holder		/s/ J. Fasone Holder
D. H. Gulyas		/s/ D. H. Gulyas
H. La Force		/s/ H. La Force
J. N. Quinn		/s/ J. N. Quinn
C. J. Steffen		/s/ C. J. Steffen
M. E. Tomkins		/s/ M. E. Tomkins

Dated: May 9, 2018