A 6'8" small forward, Quinnett played three seasons in the National Basketball Association (NBA).

Upon graduation from Washington State University, Quinnett was selected by the New York Knicks in the second round (50th pick overall) of the 1989 NBA draft.

He played mainly for the Knicks, and also had a brief 1991–92 stint with the Dallas Mavericks (traded for center James Donaldson).

After leaving the NBA, Quinnett played briefly in the Continental Basketball Association (CBA) and also overseas for Spain's CB Murcia.

This biographical article relating to a United States basketball player, coach, or other figure born in the 1960s is a stub.