A lot of SF writers did TV tie-in novels back then. Keith Laumer did so for "The Invaders".
And of course James Blish did
Star Trek. What's intriguing is that he put in allusions to events and entities from his own original fiction, basically treating ST as if it took place in his
Cities in Flight universe (albeit with one or two references to his other fiction, I think). It goes to show that back then, Blish was bigger than Trek, at least in SF circles.
There's also Isaac Asimov's novelization of the film
Fantastic Voyage, in which he heavily revised the story to make it more scientifically plausible. The novelization was actually released before the movie to build interest for it (an alien concept in our spoiler-phobic era), so people often mistake the movie for an adaptation of the book instead of the reverse.
Let's see, Thomas M. Disch wrote the first tie-in novel to
The Prisoner. Looks like there were also tie-ins to
Voyage to the Bottom of the Sea by Paul W. Fairman and
Lost in Space by Dave Van Arnam and Ted White (under the name Ron Archer). I don't think I've heard of any of those authors.
Of course, by the mid-'70s or so, nearly all novelizations were by Alan Dean Foster.