Two of the true innovators and original pioneers of the comic book industry died recently.

Jerry Robinson died Wednesday, December 7, at the age of 89. Robinson will forever be most linked with the 1940 creation of Batman’s nemesis and possibly the first super-villain, The Joker. During this time, he also co-created Robin the Boy Wonder to be Batman’s sidekick, which established what soon became an iconic narrative device for superhero comics, and of course the inevitable wave of sidekick imitators. As if forever changing the superhero genre wasn’t enough, he also created another iconic element of Batman, Bruce Wayne’s butler Alfred. Following his genre-defining work in superhero comics in the 1930s and ’40s, Robinson went on to fight for creator rights (notably in support of Jerry Siegel and Joe Shuster, co-creators of Superman), write The Comics: An Illustrated History of Comic Strip Art (one of the earliest publications to detail the history of the art form [Dark Horse Comics published a revised and expanded edition earlier this year]), as well as establish CartoonArts International, a syndicate that helped create distribution networks for political cartoonists around the world. He is the only person to have served as President of both the National Cartoonists Society (NCS) and the Association of American Editorial Cartoonists (AAEC), and also served as guest curator for several art galleries hosting shows featuring comics art.

Joe Simon died last Thursday, December 14, at the age of 98 of an undisclosed illness. In late 1940 with his partner Jack Kirby, Simon created Captain America, one of the first and certainly the most influential superhero meant to stir up patriotism as the United States considered involvement in World War II. The first issue of Captain America Comics, released in December 1940 (cover-dated March 1941), brazenly featured Captain America slugging Adolf Hitler in the jaw right on the cover. While Hitler now seems like a comic book villain, he was then a real-world political leader. With nearly one million copies sold, it was considered an instant hit and got the attention of Nazi sympathizers and anti-war activists who wrote angry and even threatening letters. Flag-draped superheroes soon came out of the woodwork but few could compete. Simon served as head editor of the Marvel Comics precursor, Timely Comics, during this time, but soon moved on with Kirby to create a brand new genre for the comics art form: romance. Now frequently satirized, romance comics were a massive hit and brought in a whole new demographic. The two were also pioneers in establishing the horror and true crime genres in comics, which were also huge sellers. Simon went on to consult for Harvey Comics in the 1960s, helping to develop then new characters Casper the Friendly Ghost and Richie Rich. Simon also wrote two autobiographies, The Comic Book Makers and this year’s Joe Simon: My Life in Comics.

Indicative of how small the industry is and was back then, the two shared studio space in New York City for a time.