His father's formerly successful plywood business went into a decline during his teens, the family returned to London, and the younger Lewenstein left school.
[3] In 1969, Lewenstein opened The Roundhouse in Camden Town as a theatrical venue for the experimental American collective The Living Theatre.
[3] Lewenstein optioned Joe Orton's screenplay Up Against It after Brian Epstein, the manager of The Beatles, had rejected it as a project for his clients, but the film was never made.
[1] He married the potter (and later journal editor) Eileen Edith Lewenstein (née Mawson) in 1952, his second wife;[1] the couple had two sons.
[12] Lewenstein's memoir Kicking Against the Pricks: A Theatre Producer Looks Back was published in 1994[9] by Nick Hern Books.