Over the next five decades, he created covers for hundreds of books and magazines (and much more interior artwork), notably "Astounding Science Fiction", both before and after its title change to "Analog", from 1953 to 2003. He started at "Mad" magazine in February 1957 and by July 1958 was the magazine's new cover artist; he painted most of its covers until October 1962 (featuring the iconic character, Alfred E. Neuman). He also created cover illustrations for DAW, Signet, Ballantine Books, Avon, all 58 Laser Books (which are now collectors' items), and over 90 covers for Ace books alone. He was editor and artist for the first ten "Starblaze" books. He illustrated the cover of Jean Shepherd, Ian Ballantine, and Theodore Sturgeon's literary hoax, "I, Libertine" (Ballantine Books, 1956). That same year he drew cartoon illustrations for Bernard Shir-Cliff's "The Wild Reader".