American comic book Kane and Bill Finger created Batman, who debuted in "Detective Comics" #27 (1939). The period from the late 1930s through roughly the end of the 1940s is referred to by comic book experts as the Golden Age of comic books. It featured extremely large print-runs, with "Action Comics" and "Captain Marvel" selling over half a million copies a month each; comics provided very popular cheap entertainment during World War II especially among soldiers, but with erratic quality in stories, art, and printing. In the early 1940s over 90 percent of girls and boys from seven to seventeen read comic books.
Bob Kane from DeWitt Clinton High School and then legally changed his name to Robert Kane. He studied art at Cooper Union before "joining the Max Fleischer Studio as a trainee animator in the year of 1934". He entered the comics field two years later, in 1936, freelancing original material to editor Jerry Iger's comic book "Wow, What A Magazine!", including his first pencil and ink work on the serial "Hiram Hick". The following year, Kane began to work at Iger's subsequent studio, Eisner & Iger, which was one of the first comic book "packagers" that produced comics on demand for publishers