He served as president of the Association of American Agricultural Colleges and Experiment Stations (1912–1913) and served on the association's committees on nomenclature, uniform fertilizer laws, and seed testing. Jenkins was a member of the Connecticut Forest and Park Association, a member of the Society for the Promotion of Agricultural Science, and a fellow of the American Association for the Advancement of Science. He served on the board of governors of the New Haven Hospital for 20 years and served as president of the Graduate Club of New Haven from 1900 to 1905.[1][2]