By the early 1950s, he was working as assistant to producer George Stevens at Paramount Pictures, on films including A Place in the Sun (1951) and Shane (1953).
Writer and producer Joel Rogosin described Horwitz as "very innovative", producing one episode in real time, another with no dialogue, and another in which the star, Efrem Zimbalist Jr., was the sole performer.
[6] Horwitz died at June Lake, California, aged 58, following a fall when on a family holiday.
He was the uncle of singer and songwriter Lesley Gore, who appeared in the role of Pussycat in the Batman series,[7] and of her brother, film composer Michael Gore.
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