John died peacefully Jan. 21, 2019, in his home at Lincoln University near Oxford, Pa. 

He came to Princeton from Liberty High School in Bethlehem, Pa., and left before finishing his degree. John graduated from Case Western Reserve in 1965 and received a Ph.D. in organic chemistry from Yale University in 1970. 

After graduation John was hired as a chemist for the DuPont Co. in Wilmington, Del., and worked there until his retirement in 2001. He worked on many novel materials while at DuPont, including Kevlar and Tyvek, and holds several patents. He also worked for the joint-venture DuPont/Toray Co. and spent several years living and working in Japan.

John is survived by his wife of 29 years, Hiroko Takahashi Cooper; daughters Sarah Foley and Charity Pitcher-Cooper; son David; their mother, Susan Pitcher; and three grandchildren. The class sends condolences to the family.

Undergraduate Class of 1963