Naoki Inaba has invented over 400 new types of puzzle, and also writes Sudoku and other popular puzzles for magazines in Japan, where he has published several books of area mazes for children and adults.
Ryoichi Murakami is the founder and CEO of El Camino, a premier cram school in Tokyo. Many of his students go on to elite schools such as the University of Tokyo, and compete in the International Mathematical Olympiad. In addition to teaching at El Camino, Murakami is active in publishing, works as a puzzle maker, and writes questions for the Olympiad.
Alex Bellos holds a degree in mathematics and philosophy from Oxford University. His bestselling books include Heres Looking at Euclid and Can You Solve My Problems? He is the coauthor of two coloring books, Patterns of the Universe and Visions of the Universe. He writes a popular math blog and a puzzle blog for the Guardian.