Gessler began his career at
Esso, joining in 1942. His most cited work is a 1959 patent on regarding a process for preparing a vulcanized blend of crystalline polypropylene and chlorinated butyl rubber. He was a mentor to
Edward Kresge and coworker of
William J. Sparks. He studied the chemical interaction between carbon black and various polymers. He served as chairman of the New York Rubber group in 1966. He was an organizer of the 1971
Gordon Conference on Elastomers. He is credited among the chief organizers of the popular text
Science and Technology of Rubber. He was the 1986 recipient of the
Melvin Mooney Distinguished Technology Award. At his retirement with 38 years of service, his title was senior research chemist. == References ==