Gene Roddenberry" and "Michael Garrison" were just as important as the stars.
When it came to The Twilight Zone, there were three writers who popped up frequently: Rod Serling, Charles Beaumont, and Richard Matheson.
I was saddened to hear about Matheson's recent passing; after all, I had some memories of Serling (via Night Gallery), and Beaumont via the now long out-of-print Howling Man collection. Matheson, however, was one of the more easily "discoverable" authors that I read.
Yes, he wrote horror, but not the kind of neo-Gothic or Lovecraftian pastiche that might have been prevalent. Matheson's work was grounded in real-life, whether it be the faceless truck driver in Duel (which scared the whatever out of me as a child) or the great reversal in I Am Legend (do yourself a favor and read the book; ignore the Will Smith movie, it's ok if you do so. I won't blame you).
One of the advantages of an author's passing is that he (or she) often leaves a treasure trove of great writing to enjoy. The best way to honor Richard Matheson - buy or borrow (from the library) one of his books.