Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Ralph Hartzler Fox (March 24, 1913, Morrisville, Pennsylvania – December 23, 1973, Philadelphia) was an American mathematician. As a professor at Princeton University, he taught and advised many of the contributors to the Golden Age of differential topology, and he played an important role in the modernization and main-streaming of knot theory. Ralph Fox attended Swarthmore College for two years, while studying piano at the Leefson Conservatory of Music in Philadelphia. He earned a master's degree from Johns Hopkins University, and a Ph.D. degree from Princeton University in 1939. His doctoral dissertation, On the Lusternick-Schnirelmann Category, was directed by Solomon Lefschetz. (In later years he disclaimed all knowledge of Lyusternik-Schnirelmann category, and certainly never published on the subject again.)

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