Schnapp lettered comics stories of every kind for DC Comics beginning in the early 1940s, including humor, funny animals, romance, western, characters licensed from movies and TV shows, and super-heroes. He also produced lettering for the Superman and Batman comic strips. Despite his brilliance as a logo and title designer, in the words of comics historian Kirk Kimball, "Schnapp's word-balloon lettering was ... surprisingly pedestrian." By comparison, his balloon lettering for covers was more polished and precise, but still often sedate. Pop artist Roy Lichtenstein used the splash page of a romance story lettered by Schnapp in Secret Hearts #83 (November 1962) as the basis for one of Lichtenstein's most iconic works. Lichtenstein slightly reworked the art and dialogue, and re-lettered Schnapp's original word balloon. Drowning Girl (1963) is now part of the permanent collection of the Museum of Modern Art, New York.
