[2] Moving on to Southern Illinois University, Glenn was an All-Missouri Valley Conference college basketball player,[3] graduating with honors and a B.S.

[citation needed] He would go on to play ten seasons (1977–1987) in the National Basketball Association as a member of the Buffalo Braves, New York Knicks, Atlanta Hawks, and Milwaukee Bucks.

[3] Drafted twenty-third overall by the Chicago Bulls in 1977, Glenn broke his neck in an offseason auto accident and was released from the team.

He was noted for his smooth midrange jump shot, which not only contributed to his high shooting percentage (an amazing mark for a 6'3" guard), but also earned him the nickname "The Stinger" early in his career from his Knicks teammates.

Because of his business background, Glenn was also employed in the early 1990s by Merrill Lynch as a consultant for the NBA's pre-pension plan.