Began as assistant on Will Eisner's The Spirit and by 1949 was handling pencils and inks for romance comics. Collaborated with Harry Harrison on Rangeland Romances in early 1950s (including providing voluptuous cowgirls and pin-ups).

Helped make E. C. and MAD huge hits in the 1950s. Drew for all the major houses: D C, Marvel, Gold Key, Fawcett, Fox Features, Archie. Perhaps best known for his sci-fi, in which earthy earth women, bug-eyed-monsters, laser-wielding spacemen, and sharply shadowed spaceships jumped off covers and pages. But he also worked in everything from war stories to westerns, crime to celebrity (Dorothy Lamour, Judy Canova), super heroes to zombies.

An award-winning inker for the pencils of other greats, like his idol, Jack Kirby.