While she stands out in various other ways, Harley Quinn is far from the only prominent Jew in the world of comic books, in which we have a strong history, both on and off the page. The legendary writer Stan Lee, for instance, was Jewish and created much of the Marvel universe. Martin Goodman, who founded Timely Comics, which went on to be Marvel, was Jewish, too, as were Joe Simon and Jack Kirby, the pair behind Captain America; Bob Kane and Bill Finger, who devised Batman; and, of course, Jerry Siegel and Joe Shuster, the two Jewish teenagers who created...