 Many philosophers and historians of philosophy were teachers at the Sorbonne, the University of Paris, including Léon Brunschvicg  (1869–1944), co-founder of the "Revue de Métaphysique et de Morale" with Xavier Léon and Elie Halévy, Martial Guéroult (1891–1976) and successor of Étienne Gilson at the Collège de France in 1951, Ferdinand Alquié, Paul Ricœur, etc.Jean Wahl taught between 1936 and 1967 and helped introduce the philosophy of Søren Kierkegaard to French thinkers.Emmanuel Mounier (1905–1950) was a guiding spirit in the French personalist movement, and founder and director of "Esprit", the magazine which was the organ of the movement.