David Singmaster Author

Dr Alexander H. Frey, Jr., received his PhD in Mathematics in 1960. He worked for over thirty years for IBM, and then for fifteen years on distributed file system technology. Now retired, he pursues his interest in the mathematical properties of many puzzles, including Sudoku and four and five dimensional Rubik's cubes. David Singmaster is recognised as the world's leading authority on the mathematics of Rubik's Cube. An American by birth and citizenship he was until his retirement a Lecturer in Mathematical Sciences at South Bank University, London, England. His earlier Notes on Rubik's Magic Cube was described by Scientific American as 'the definitive treatise'.