Curt Siodmak was a screenwriter who was associated with Universal Pictures. He is mostly remembered for his contributions to the Wolf Man franchise. According to movie historian Tom Weaver, Siodmak is almost single-handedly responsible for bringing the lore of the werewolf into modern American pop culture. He spent several years researching German folklore concerning werewolves, but ultimately came away unsatisfied. When scripting The Wolf Man, he instead decided to create his own folklore including a werewolf's anathema to wolfbane and their vulnerability to weapons made of silver. He also authored the gypsy poem that has become synonymous with The Wolf Man.