Versatile is an understatement when trying to describe this wonderful talent. From the 1950's until his death in 1992, John Anderson went from television good guy to bad guy so many times one would need more than a chart to track his every role. There are so many levels to any one of his performances it's hard to believe that each one is vastly different from the next.
For example, watch a few seasons of the The Rifleman and see if you can spot him from role to role. In that series, he was usually cast as the villain where each character not only sounded, but looked different as well. Then watch a few seasons of the Twilight Zone and see all of the good characters he played over the years like the angel Gabriel in the episode A Passage for Trumpet or the captain of the airplane that can't find the present time in The Odyssey of Flight 33 and you will find yourself rubbing your eyes and scratching your head in disbelief that this is the same actor.
You'll find a lot of westerns on his resume from Have Gun Will Travel to Gunsmoke just to name a few and watching those old shows you'll get the feel that he was typecast in that genre. Then you may catch him in an episode of Rat Patrol or Quincy, M.D. and you will soon realize the scope of his talents and why John Anderson was impossible to typecast because he was never the same. That's the mark of a real actor. And sadly, a Not Very Famous one.