He was the "script boy" for
The Arizona Ranger (1948), a film starring father-and-son actors Jack Holt and Tim Holt. In 1957 Laven convinced his old
friend Tim, who had retired from Hollywood five years earlier and was
living on his Oklahoma ranch, to return for the leading role in Laven's sci-fi project The Monster That Challenged the World (1957).
Began his career as a mail room messenger at Warner Bros.