Jerry SlocumJerry Slocum, a retired Aerospace executive, is a historian, collector and author specializing in the field of mechanical puzzles. His personal collection of over 40,000 mechanical puzzles is believed to be the world's largest. It includes hundreds o puzzle padlocks including 34 Roman mask puzzle padlocks. He is the author of 16 earlier books on puzzles and their history including Puzzles Old and New in 1986, The 15 Puzzle, The Cube (about Rubik's Cube), and The Tangram Book. In 2006, Slocum donated his entire puzzle collection and library of over 5,000 puzzle books to the Lilly Library at Indiana University, marking the first time a major collection of mechanical puzzles was made available to the public in an academic setting. He also founded The International Puzzle Collectors' Party in 1978 that organizes annual gatherings in Asia, Europe and the USA of as many as 450 serious puzzle collectors from all over the world. Until his retirement in 2011. Read More Read Less