Premise: William Gurstelle (born March 29, 1956) is an American nonfiction author, magazine writer, and inventor. He is a feature columnist for "Make" magazine and a columnist and contributing editor at "Popular Science" magazine. Previously, he was the Pyrotechnics and Ballistics Editor at "Popular Mechanics" magazine.
Hypothesis: William Gurstelle is a feature columnist for "Make" magazine and has contributed to several popular science and mechanics magazines.