1813-1855. Danish philosopher considered to be the founder of existentialism. Disagreeing with the German dialectical philosopher Hegel, he argued that no system of thought could explain the unique experience of the individual. He defended Christianity, suggesting that God cannot be known through reason, but only through a `leap of faith'. He believed that God and exceptional individuals were above moral laws. Kierkegaard was born in Copenhagen, where he spent most of his life. The son of a Jewish merchant, he converted to Christianity in 1838, although he became hostile to the established church and his beliefs caused much controversy. A prolific author, his works include Enten-Eller/Either- Or 1843, Begrebet Angest/Concept of Dread 1844, and Efterskrift/Post-script 1846, which summed up much of his earlier writings.