His major work was ''Being and Time'' (1927) which was fundamental in the development of existentialism - and many other strands of twentieth century thought - although Heidegger himself denied he was an existentialist. | His major work was ''Being and Time'' (1927) which was fundamental in the development of existentialism - and many other strands of twentieth century thought - although Heidegger himself denied he was an existentialist. |