Walt Simonson took over both writing and art as of #337 (Nov. 1983). His stories placed a greater emphasis on the character’s mythological origins. Simonson’s run as writer-artist lasted until #367 (May 1986), although he continued to write – and occasionally draw – the book until issue #382 (Aug. 1987). Simonson’s run, which introduced the character Beta Ray Bill, was regarded as a popular and critical success. Simonson’s later stories were drawn by Sal Buscema, who describes Simonson’s stories as “very stimulating. It was a pleasure working on his plots, because they were a lot of fun to illustrate. He had a lot of great ideas, and he took Thor in a totally new direction.” Asked why he was leaving Thor, Simonson said that he felt the series was due for a change in creative direction, and that he wanted to reduce his work load for a time. After Simonson’s departure, Marvel’s editor-in-chief at the time, Tom DeFalco, became the writer. Working primarily with artist Ron Frenz, DeFalco stayed on the book until #459 (Feb. 1993).