Freiberger... was a fine writer/producer in his element - which wasn't science fiction.
Except that a very large part of his resume is science fiction. He co-wrote
The Beast from 20,000 Fathoms, the prototype for the giant-monster genre in both America and Japan. He was a producer on
The Wild Wild West and
The Six Million Dollar Man for a short time as well as ST,
Space: 1999, and
Beyond Westworld. His writing credits include episodes of
Men into Space, Sealab 2020, Josie and the Pussycats in Outer Space, Super Friends, and
Superboy.
I'd say the only other genre that was a major part of Freiberger's resume was Westerns. Is that what you're referring to as "his element"? It seems to me, though, that anyone working in television in the '50s and '60s would have a lot of Westerns on his resume.