Phenomenology (philosophy) which focuses on the work and followers of Edmund Husserl (April 8, 1859 – April 26, 1938)
Existential phenomenology which focuses on the work and followers of Martin Heidegger (September 26, 1889 – May 26, 1976), himself a follower of Husserl
Dialectical phenomenology which focuses on the earlier work of Georg Hegel (August 27, 1770 – November 14, 1831)
