- His first acting role was in his high school's production of Our Town.
- Served for a time in the Air Force, but received a hardship discharge after the death of his father.
- Trained for two years at the American Theatre Wing in New York.
- For 23 years, performed as a resident actor at Arena Stage in Washington, D.C.
- Best-known to TV audiences as Sgt. Stan Jablonski on Hill Street Blues.
- 1984, Tony — Actor (Featured Role--Play): Nominee
- 1988, Tony — Actor (Play): Nominee
- Helen Porzuczek — Mother
- John Prosky — Son
- Ida Hove — Wife
- Stefan Prosky — Son
- Andy Prosky — Son
- Joseph Porzuczek — Father
- Temple University, Philadelphia, Pennsylvania, United States