David Millar is a puzzle author and graphic artist who combines both disciplines to craft puzzle and gaming materials. A lifelong stationery nerd, he is never without many trusty notebooks full of graph paper, whose contents span puzzle grids, dungeon maps, user interface designs, sticker ideas, and beyond. In addition to a career in web application development and software engineering, David has more than a decade of puzzle blogging under his belt, and his puzzles have previously featured in UK and World Puzzle Championships. He resides in Fort Worth, Texas. Fred Coughlin has a PhD in inorganic chemistry, and has been solving and creating puzzles since childhood. He also published puzzles in The Art of Puzzles and on PuzzlePicnic.com, and has appeared as a contestant on Who Wants to Be a Millionaire? and Wheel of Fortune. He is happily married, with three daughters who are on their way to becoming avid puzzlers themselves. American Mensa has members who range in age from 2 to 102, and the community includes people from every walk of life. They include engineers, homemakers, teachers, actors, athletes, students, and CEOs, and all share one trait—high intelligence. To qualify for Mensa, members scored in the top 2 percent of the general population on an accepted standardized intelligence test.