- Was an understudy to John Travolta on Broadway in Grease in 1973, later taking over for him.
- Costarred with Travolta and the Andrews Sisters on stage in 1974's Over Here.
- Made film debut as a detective in the screen version of The Ritz (1976).
- Appeared opposite Blythe Danner and Judith Ivey in the 2001 Broadway revival of Stephen Sondheim's Follies.
- Portrayed patriarch Dr. Andrew Brown on The WB's Everwood for four seasons.
- Fulfilled a childhood dream by earning a pilot license in 1973, becoming a certified flight instructor and authoring the 2010 children's book Air Show!
- 1980, Golden Globe — New Star of the Year - Actor: Nominee
- 1985, Golden Globe — Best Performance by an Actor in a Miniseries or Motion Picture Made for Television: Nominee
- 1982, Golden Globe — Best Performance by an Actor in a Motion Picture - Drama: Nominee
- 1996, Emmy — Outstanding Supporting Actor for a Miniseries or a Special: Nominee
- 2002, Screen Actors Guild Awards — Outstanding Performance by a Male Actor in a Drama Series: Nominee
- 2003, Screen Actors Guild Awards — Outstanding Performance by a Male Actor in a Drama Series: Nominee
- 1986, Independent Spirit Awards — Best Male Lead: Nominee
- Gill Williams — Son
- Marion Williams — Mother
- Elinor Williams — Daughter
- Pamela Van Sant — Wife
- Richard Norman Williams — Father
- Franklin & Marshall College, Lancaster, Pennsylvania, United States (BA, 1973)
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