Williamson's career was so long that it's difficult for me to pin down what he was most famous for. There was his work for EC in the 1950's:
|Feldstein (writer) Williamson (art)|
His work on the Flash Gordon daily (see top) as well as his work for Warren publishers Eerie and Creepy magazines:
And, my personal favorite, Star Wars in the 80's:
The above art is from his work on the Star Wars daily comic strip. This work was collected and reprinted in a three volume hardcover set by publisher Russ Cochran. It is printed in its original format with all bumper art included. It's more than amazing and a must have if you are a Williamson or Star Wars fan. What a happy accident that I'm both. There are a few up on Ebay ranging in price from $300 to $1950. Good luck and happy hunting!