Edward Hordern
Edward Hordern (1941 - May 2, 2000) was perhaps the world's leading authority on sliding block puzzles, and was renowned for his puzzle solving abilities.
Hordern had an extensive mechanical puzzle collection and was an author on the topic of mechanical puzzles. His best known book is "Sliding Piece Puzzles", originally published in 1986 by Oxford University Press (ISBN 0-19-853204-0).
In 1993, Hordern edited and privately published a centenary edition of the famous "Puzzles Old & New" by Professor Hoffman, including photographs of many original Hoffman puzzles from Hordern's collection.
At least a portion, and perhaps all, of Hordern's puzzle collection, including the famed Hoffman puzzles, were bequeathed to collector James Dalgety, founder of Pentangle Puzzles and curator of the Puzzle Museum.