According to Wikipedia,
Dr. Harmohinder Singh Gill was an American and Indian scientist, and served 35 years as a renowned plant pathologist and nematologist for the Riverside County Agricultural Commissioner's Office in the state of California under the direction of Robert M. Howie. George A. Zentmyer, professor and chairman in the plant pathology department at the University of California, Riverside, arranged for Gill to be appointed adjunct professor, with his own laboratory at the campus from 1968 to the early 1980s. Working with Zentmyer, Gill continued his work on elucidating the genus phytophthora by disc electrophoresis and serological techniques, which pioneered the fungi classifications in the field Plant Pathology. Gill taught his techniques to graduate students at the university and contributed articles in the Press Enterprise about various plant diseases. On February 4, 1993, the Press Enterprise published a feature article on Gill and his work on citrus-hungry aphids that caused the loss of citrus crops extending from Central America.
Harmohinder Singh Gill is affiliated with the following schools: