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.

Based on that paragraph can we conclude that this sentence is true?
William Gurstelle is a feature columnist for "Make" magazine and has contributed to several popular science and mechanics magazines.
Yes