​From Wikipedia, the free encyclopedia Barry Dennen (born February 22, 1938) is an American actor, singer, and writer. Dennen was born in Chicago, Illinois. In New York City from 1960 to 1963, he had a relationship with Barbra Streisand, including living together for a year, during which time he helped her develop the nightclub act that began her successful career as a singer and actress. He moved to London for fifteen years and in 1968 landed the starring role of the master of ceremonies in the London version of Cabaret. In 1970, he played…