In 1967, Batman artist Infantino (who had designed popular Silver Age characters Batgirl and the Phantom Stranger) rose from art director to become DC's editorial director. With the growing popularity of upstart rival Marvel Comics threatening to topple DC from its longtime number-one position in the comics industry, he attempted to infuse the company with more focus towards marketing new and existing titles and characters with more adult sensibilities towards an emerging older age group of superhero comic book fans that grew out of Marvel's efforts to market their superhero line to college-aged adults. He also recruited major talents such as ex-Marvel artist and Spider-Man co-creator Steve Ditko and promising newcomers Neal Adams and Denny O'Neil and replaced some existing DC editors with artist-editors, including Joe Kubert and Dick Giordano, to give DC's output a more artistic critical eye.