Performed with family in NYC in 1930s

Broadway debut, "Life With Father" (as child actor)

Film debut, "Family Honeymoon"

Appeared in stage productions throughout the 1950s and 1960s, including "Look Back in Anger" (1958) and "On a Clear Day You Can See Forever" (1965)

TV debut, "The Somerset Maugham Theatre" (ABC)

Starred in "The Zoo Story" on New York stage

Cast as the fiance of the social worker heroine (Sandy Dennis) in "A Thousand Clowns" on Broadway

Played Ben Braddock's father in "The Graduate"

First series, title role in "Captain Nice" (NBC)

Played John Adams in "1776" on Broadway; refused a Tony Award nomination as Best Featured Actor in a Musical

Reprised stage role in film "1776"

Succeeded Len Cariou as Frederick Egermann in the Stephen Sondheim-Hugh Wheeler musical "A Little Night Music"

Played John Quincy Adams in the PBS miniseries "The Adams Chronicles"

Was Lt. Cdr. Kitteridge on "The Nancy Walker Show" (ABC)

Played Samuel Adams in "The Bastard" (ABC)

Cast as G. Gordon Liddy in the CBS miniseries "Blind Ambition"

Played John Adams in ABC miniseries "The Rebels"

had regular role of D.A. Cruikshank on "Freebie and the Bean" (CBS)

Provided the voice of KITT, the car, on "Knight Rider" (NBC)

Appeared as Dr. Mark Craig on "St. Elsewhere" (NBC); won two Emmy Awards for his work

Portrayed Mr. Feeny on ABC sitcom "Boy Meets World"