Hanna (July 1, 1903 – December 23, 1993, known as "Jack" Hanna) was a University of California-Davis agronomy professor who helped revolutionize the tomato-growing industry.
He won the John Scott Award in 1976 for his development of a tomato variety capable of being machine-harvested.
The variety came to be known as the "square tomato," being slightly blockier, preventing it from rolling off conveyor belts.