Martin Heidegger was a German philosopher whose work was central to the development of phenomenology, hermeneutics, and existentialism. He has had significant impact within subsequent philosophy, social sciences and humanities, and theology. September 26, 1889 – May 26, 1976; died at 86. Alive at the same time as Barack Obama, Albert Einstein, Leo Tolstoy, Pablo Picasso, and Pope Francis. Wiki link