Silliman was a 6'6" forward from West Point, where he played for coach Bob Knight and took Army to the NIT Semi-Finals in 1964, 1965, and 1966.

He participated in the 1968 Summer Olympics and won a gold medal as captain of the United States national basketball team.

A three-year basketball letter winner and All-American, Silliman netted more than 1,000 points without the benefit of the three-point line and without the shot clock to speed up shooting.

He was a member of the 1966 team that finished 16-4 and won its second straight Eastern Intercollegiate Baseball League championship.

This biographical article relating to a United States basketball player, coach, or other figure born in the 1940s is a stub.