Ron Leibman (born October 11, 1937) is an American actor. He won the Tony Award for Best Actor in a Play in 1993.
Leibman was a member of the Compass Players in the late 1950s, and was admitted to the Actors Studio shortly thereafter. He has appeared in many films such as Phar Lap; Where's Poppa?; The Hot Rock; Slaughterhouse-Five; The Super Cops; Up the Academy; Norma Rae; Romantic Comedy; Zorro, The Gay Blade; Garden State; and Rhinestone. He co-starred with second wife Jessica Walter in Neil Simon's play Rumors. They also appeared together as husband and wife in the film Dummy and in the TV Series Law & Order in the episode, "House Counsel."
He won an Emmy Award for his convict-turned-lawyer character in Kaz (1978–79), a series which he also created and co-wrote. Leibman also received a Tony Award for his performance as Roy Cohn in the Pulitzer Prize-winning play Angels in America. He is also widely known for his portrayal of Dr. Leonard Green, Rachel Green's overbearing father, on the sitcom Friends. Leibman had a recurring role on The Sopranos as Dr. Plepler. and in the voiced episode of Rugrats as the Old Man.
In 1983, Leibman starred in the Australian movie Phar Lap as David J. Davis, the owner of legendary New Zealand/Australian racehorse Phar Lap who won the 1930 Melbourne Cup and the 1932 Agua Caliente Handicap.
In 2013, Leibman began appearing as a recurring character on the TV series Archer as Ron Cadillac. He stars as the husband to Mallory Archer, voiced by his real life wife Jessica Walter.
Leibman was born in New York City, New York, the son of Grace (née Marks) and Murray Leibman, who worked in the garment business. He graduated in 1958 from Ohio Wesleyan University. He has been married to actress Jessica Walter since 1983. He was previously married to actress Linda Lavin (1969–1981). He currently teaches at The New School in New York City where he has also served as acting department chair.