Korman was of Russian Jewish descent and born in Chicago, the son of Ellen (née Blecher) and Cyril Raymond Korman, a salesman. He served in the United States Navy during World War II. After being discharged, he studied at the Goodman School of Drama at the Art Institute of Chicago (now at DePaul University) and at HB Studio. He was a member of the Peninsula Players summer theater program during the 1950, 1957, and 1958 seasons.
Korman's first television role was as a head waiter in The Donna Reed Show episode, "Decisions, Decisions, Decisions". He appeared as a comically exasperated public relations man in a January 1961 episode of the CBS drama Route 66. He was seen on numerous television programs afterwards including the role of Blake in the 1964 episode "Who Chopped Down the Cherry Tree?" on the NBC medical drama The Eleventh Hour and a bartender in the 1962 Perry Mason episode, "The Case of the Unsuitable Uncle." He frequently appeared as a supporting player on The Danny Kaye Show from 1963 through 1967. He was cast three times, including the role of Dr. Allison in "Who Needs Glasses?" (1962), on ABC's The Donna Reed Show. He also guest-starred on Dennis the Menace and on the NBC contemporary western series Empire.
From 1964 to 1966, he appeared three times in consecutive years on the CBS comedy The Munsters starring Fred Gwynne and Yvonne De Carlo. During the 1965–1966 season, Korman appeared regularly on ABC's The Flintstones as the voice of The Great Gazoo in its final season on network television.

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