- Before his interest in acting developed, he wanted to be a journalist.
- Worked in theater for years before making his film debut as Tom Cruise's best friend in 1983's Risky Business.
- Perhaps most recognized for playing Dudley "Booger" Dawson in the feature films Revenge of the Nerds (1984) and Revenge of the Nerds II: Nerds in Paradise (1987). Reprised his role for the TV movies Revenge of the Nerds III: The Next Generation (1992) and Revenge of the Nerds IV: Nerds in Love (1994).
- Appeared on television for the first time when he joined the second season of ABC's Moonlighting.
- A prolific character actor, he made guest appearances on such shows as Murphy Brown, Felicity, Ed and One on One.
- Lily Armstrong — Daughter
- Elaine Aronson Armstrong — Wife
- Robert Armstrong — Father
- Norma E. D'Amico — Mother
- Oakland University, Detroit, MI; Academy of Dramatic Arts, Pontiac, MI
Season 10, Episode 1
- Birth Place: Detroit, MI
- Birthday: November 27, 1953, Sagittarius
- Profession: Actor