"I took a degree in agriculture because I intended to go to Israel to work the land," he says.
When he finished his studies, Greene was obliged to serve in the Canadian Army, which had given him a scholarship. But after less than a year in an officer's training program he left the army to pursue advanced degrees in food science at the University of Minnesota. That's also where he met Gail, his wife-to-be.
The couple remained in Minnesota until 1956, when Greene began teaching bacteriology at Southwestern Louisiana Institute in Lafayette, La., the first American integrated college. When the Supreme Court, in its famous Brown v. Board of Education decision, ordered integration of public schools and universities, half of the school's faculty chose to resign rather than teach black students.
"It was a very critical time," says Greene. "Like a lot of Jews, I was at the forefront of the civil rights movement. I got this great opportunity to be a part of the revolution, so I went."