Theodoor Hendrik van de Velde (Feb 12 1873, Leeuwarden - April 27 1937 near Locarno in a plane crash) was a Dutch physician and gynæcologist who served as Director at the Gynæcological Institute in Haarlem. His 1926 book Het volkomen huwelijk (The Perfect Marriage) made him an instant international celebrity. The book advocated knowledge and sensuality in erotic life. In Germany Die vollkommene Ehe reached its 42nd printing in 1932 in spite of the fact that it was placed on the list of forbidden books, Index Librorum Prohibitorum by the Roman Catholic Church. In protestantic and socialistic Sweden, Det fulländade äktenskapet was widely known although regarded as pornographic and unsuitable for young readers long into the 1960s.
The English translation, was the best-known work on its subject for several decades, and was reprinted 46 times in the original edition, selling well over a half-million copies.
He is credited with showing in 1905 that women only ovulate once per menstrual cycle - thus contributing to the Rhythm method of birth control.
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