[2] His stage roles include Marchbanks in Shaw's Candida, Mercutio in Romeo and Juliet, Morgan Evans in The Corn Is Green, Algernon in The Importance of Being Earnest, Constantin in The Seagull, and Edmund in Long Day's Journey into Night.

[2] His film credits include Scorpio (1973), The Stone Killer (1973), The Terminal Man (1974), Rooster Cogburn (1975) and Child's Play (1988) among others.

[1][2][4] Other television roles were on programs such as Quincy, M.E., Switch, The Rockford Files, The Six Million Dollar Man, Kojak, and The Bionic Woman.

[citation needed] Colvin served as the artistic director of the Michael Chekhov Studio USA West, a position he founded, until his death in early December 2005.

[2] Colvin won Los Angeles' Drama-Logue Awards in five separate categories, as actor, director, playwright, producer, and production designer.