Jaap van Praag
Jacob Philip "Jaap" van Praag (Dutch pronunciation: [ˈjaːkɔp ˈfilɪp ˈjaːp fɑm ˈpraːx], born 11 May 1911 in Amsterdam, died April 1981 in Utrecht) was a Dutch humanist thinker, organiser and politician. He is widely regarded as the founder of organised secular humanism in the Netherlands and as one of the principal architects of the modern international humanist movement.
He was the founding chairman of the Dutch Humanist League (Humanistisch Verbond, 1946–1969) and the first chairman of the International Humanist and Ethical Union (IHEU, now Humanists International), serving from its inception in 1952 until 1975.
Before World War II, Van Praag was a socialist and pacifist activist. As a Jew, he went into hiding during the Nazi occupation of the Netherlands.