The news articles out there tend to focus on his Marvel and DC work but I really associate him with many of the best Richie Rich stories out there. He was fantastic at the more action-oriented Richie stories. Much of that stuff hasn't been reprinted but you'll find his work pop up in some affordable Harvey Comics from the late 60s to the late 70s.
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This was one of the first Richie Rich stories that I read during the summer of 1975 that got me hooked on comics...
Amethyst was one of my favorite series, ever (I am currently binding my old issues into a hardcover). His Battlestar Galactica was also inspirational.
And, yes, he was even my favorite Richie Rich artist, before I even knew why.
Richie kinda learns about the birds and the bees...