Discovered at age ten by Lloyd Bridges

Stage debut at age ten, "Stone Jungle"

Film debut, Joseph Losey's "The Boy With Green Hair"; first appearance with fellow child actor Dean Stockwell

First TV appearance, "The Ed Sullivan Show", as a child

Demonstrated acrobatic dancing skills in his first musical Stanley Donen's "Seven Brides For Seven Brothers"

First starring role in a film, "The Young Guns"

Nominated for a Best Supporting Actor Oscar for his performance in the popular melodrama "Peyton Place"

Co-starred as Riff in Robert Wise's hit musical "West Side Story"

Last significant appearance in a major Hollywood release for three decades, Wise's "The Haunting"

Last significant appearance in a big-budget release, the international co-production "The Long Ships" starring Richard Widmark and Sidney Poitier

Starred in his first feature for exploitation producer-director Al Adamson, "Satan's Sadists"

Appeared briefly in Dennis Hopper's disastrous "The Last Movie"

Feature screenwriting debut, co-wrote with Neil Young, Dean Stockwell, Jeanne Fields and James Beshears) "Human Highway", directed by Young under a pseudonym (also acted)

Portrayed Dr Lawrence Jacoby a recurring character on the cult TV series, "Twin Peaks"

Did a guest shot on the sci-fi drama "Quantum Leap" co-starring Stockwell

Appeared as an interview subject on "Dennis Hopper: Crazy About the Movies", a Cinemax documentary

TV-movie debut, "Running Mates", an HBO romantic comedy

Made one-shot guest appearance on "General Hospital" in a song-and-dance sketch that featured his daughter Amber