Attended Pomona College in California.

Has served as honorary chair of the advisory board of Hawaii Public Television Foundation.

Ranked #7 in TV Guide's list of "TV's 25 Greatest Teen Idols" (23 January 2005 issue).

Played Cyrano on stage in 1973, the same year that The Three Musketeers (1973) was released. This makes him the first actor to play both Cyrano and a Musketeer. Jean-Pierre Cassel, who played King Louis XIII in "The Three Musketeers", returned in the sequel The Return of the Musketeers (1989) to play Cyrano, having previously played d'Artagnan in Cyrano et d'Artagnan (1964). José Ferrer played Athos in The Fifth Musketeer (1979), while Gérard Depardieu played Porthos in The Man in the Iron Mask (1998).

Shares two roles with Gérard Depardieu: Edmond Dantes from The Count of Monte Cristo, and Cyrano de Bergerac. He preceded Depardieu in both roles, playing them both in English. Depardieu played both roles in their original French.

Has appeared in film adaptations of all three of Alexandre Dumas's Musketeer novels. He played Aramis in The Three Musketeers (1973), The Four Musketeers: Milady's Revenge (1974) and The Return of the Musketeers (1989), and played Louis and Phillippe in The Man in the Iron Mask (1977). The latter film eliminates the three original Musketeers from the book; including his character of Aramis; and includes only d'Artagnan.

Living in Honolulu, Hawaii, USA. [2009]

Living in West Hollywood, Los Angeles, California, USA. After living in Hawaii for many years, he moved back to Southern California in order to pursue more acting roles, as an older actor who is also an out, and proud, gay man. [October 2010]

He was awarded the 1973 Los Angeles Drama Critics Circle Award for Distinguished Performance for the play, "Cyrano De Bergac," at the Ahmanson Theatre in Los Angeles, California.

Had an older brother William "Bill" Hayes Chamberlain who was born on November 5, 1927.

Born on the same day as Shirley Jones.

He is the first actor to play the role of Jason Bourne in The Bourne Identity (1988) miniseries.