ผู้เขียน: William Gurstelle

William Gurstelle is a professional engineer who has been researching and building model catapults and ballistic devices for more than 30 years. He is the author of The Art of the Catapult; the bestselling Backyard Ballistics; Building Bots, Whoosh, Boom, Splat; and Notes from the Technology Underground. He is a contributing editor at Make magazine and writes frequently for The Rake, Wired, and several other national magazines. He lives in Minneapolis, Minnesota.