- Trained at the Actor's Studio in New York and made his Broadway debut in 1963.
- Won Broadway's 1993 Tony Award as Best Actor (Play) for Tony Kushner's "Angels In America: Millennium Approaches."
- Faculty member in the Acting Department for The New School for Drama in NYC.
- In 1954, he enrolled in Ohio Wesleyan University to study acting. While in college, he became a member of The Compass Players, an improv troupe that also served as the training ground for Mike Nichols, Elaine May, Ed Asner, Anne Meara and Jerry Stiller.
- He created and co-wrote his own short-lived TV series Kaz (1978) as a convict-turned-lawyer.
- Appeared on the cover of TV Guide #1337, November 11, 1978. as the star CBS's "Kaz". This issue is also famous for an advertisement introducing The Star Wars Holiday Special (1978).
- He was a lifelong liberal Democrat.
- He was awarded the 1993 Antoinette Perry (Tony) Award for Best Actor in a Play for "Angels in America Part One Millennium Approaches," on Broadway in New York City.
- Alumnus of the AADA (American Academy of Dramatic Arts), Class of 1958.
- Upon his death, he was cremated and ashes are with his family.
- He was awarded the 1993 New York Drama Desk Award for Best Actor in a Play for "Angels in America Part One Millennium Approaches," on Broadway in New York City.
- Son of Grace (Marks) and Murray Leibman, who worked in the garment trade. His father was a Russian Jewish immigrant, and his mother was of Russian Jewish descent.
- Kathleen Chalfant, K. Todd Freeman, Jeffrey King, Cynthia Mace, Joe Mantello, Ellen McLaughlin, Stephen Spinella and he were awarded the 1992 Drama Logue Award for Ensemble Performance for "Angels in America" Part One "Millennium Approaches" and Part Two: "Perestroika" in a Gordon Davidson/Mark Taper Forum production at the Mark Taper Forum Theatre in Los Angeles, California.
- Brother-in-law of Richard Walter.
- Stepfather of Brooke Bowman.
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