Though his acting career did not yield great success, he functioned well at Marvel, where he obtained a full-time position. One of the first new characters created by Claremont was Madrox the Multiple Man in "Giant-Size Fantastic Four" #4 (Feb. 1975). Marvel's editor-in-chief at the time, Len Wein, who recognized Claremont's enthusiasm for the new X-Men that Wein and Dave Cockrum had created in 1975, hired Claremont, a relatively young writer, to take over the series as of issue #94 (May 1975), reasoning that doing so would not draw opposition from other writers, given the book's poor standing. Claremont approached the job as a method actor, developing the characters by examining their motives, desires and individual personalities. This approach drew immediate positive reaction. According to former Marvel editor-in-chief Bob Harras, "He lived it and breathed it. He would write whole paragraphs about what people were wearing. He really got into these people's thoughts, hopes, dreams." Claremont's take on the series has been likened to writing "the Great American Novel about complex characters who just happened to fly", incorporating surprise character developments and emotional nuances amid the operatic battles that otherwise typified American superhero comics. By his own admission, Claremont acquired a reputation for taking a long time to resolve plot threads, and longtime X-Men editor Louise Simonson recounted that whenever she was at a loss for story ideas, "All I'd have to do was go through all of the plot threads that he had left for the last year or two."