Doc Savage is a fictional character originally published in American pulp magazines during the 1930s and 1940s. He was created by publisher Henry W. Ralston and editor John L. Nanovic at Street & Smith Publications, with additional material contributed by the series' main writer, Lester Dent. The illustrations were by Walter Baumhofer, Paul Orban, Emery Clarke, Modest Stein, and Robert G. Harris. The heroic-adventure character would go on to appear in other media, including radio, film, and comic books, with his adventures reprinted for modern-day audiences in a series of paperback books, which had sold over 20 million copies by 1979. Into the 21st century, Doc Savage has remained a nostalgic icon in the U.S., referenced in novels and popular culture. Stan Lee has credited Doc Savage as being the forerunner to modern superheroes.