 During the 1950s, Meltzoff created dozens of paperback covers for novels by "Robert Heinlein" and others, and did artwork for Madison Avenue advertising agencies.He painted covers and interior spreads for magazines including "Life", "National Geographic", "The Saturday Evening Post", and "The Atlantic", providing covers to "Scientific American".With the advent of low-cost color photography and reproduction in the early 1960s, Meltzoff began painting saltwater game fish in their undersea environments.