Guy is a retired math teacher who always liked geometry. The first puzzle he ever owned was a pentomino set, back when he was a student. When his passion for puzzles became known, he received many puzzle-related gifts. But, to him, the most important gift of all was the book "1000 Casse-tete du Monde Entier" by Pieter Van Delft and Jack Botermans. He tried, and succeded in making some of the puzzles in the book. Later he started making puzzles and toys for his children and students. Using the Internet, he set out to search for other people who might share his interest, and found the Ishino Site. Now he dedicates full time to making puzzles and designing new ones. He enjoys working in wood. He finds it to be a splendid material, with its diversity of colors, grains, and textures. Guy's website, Casse-tęte, is a favorite of puzzlers around the world.