Søren Aabye Kierkegaard ( \ / ˈsɔrən ˈkɪərkəɡɑrd \ / or \ / ˈkɪərkəɡɔr \ / ; Danish : ( ˈsɶːɐn ˈkiɐ̯ɡəɡɒːˀ ) ( listen ) ) ( 5 May 1813 - 11 November 1855 ) was a Danish philosopher , theologian , poet , social critic , and religious author who is widely considered to be the first existentialist philosopher .
Søren Aabye Kierkegaard ( 5 May 1813 - 11 November 1855 ) , was a 19th century Danish philosopher and theologian , and is usually thought of as the first existentialist philosopher .