He led St. John's University to the 1959 National Invitation Tournament title and later played professionally with the Pittsburgh Rens of the American Basketball League.

Seiden was so highly respected by his peers that it took the NYC Basketball Hall of Fame only five years to induct him (1995).

Seiden was a New York City schoolboy star at Jamaica High School, leading his team to the PSAL title in 1955 as a senior.

[1] He chose to stay close to home for college, playing for Hall of Fame coach Joe Lapchick at St. John's University.

Seiden capped his senior season by being named a consensus second team All-American and won the Haggerty Award as the top player in the New York City metro area.