On September 26, 1889, German philosopher Martin Heidegger was born. He is best known for his existential and phenomenological explorations of the "question of Being". His best known book, Being and Time, is considered one of the most important philosophical works of the 20th century.
On April 8, 1859, German philosopher and mathematician Edmund Gustav Albrecht Husserl was born. He is best know as the founder of the 20th century philosophical school of phenomenology, where he broke with the positivist orientation of the science and philosophy of his day, yet he elaborated critiques of historicism and of psychologism in logic.