Martin Heidegger was a German philosopher renowned for his work on existentialism and phenomenology. While he is often associated with existentialism, he sought to distance himself from the label. His philosophy had a significant influence on the French existentialist Jean-Paul Sartre. Heidegger offered a phenomenological critique of Immanuel Kant and wrote extensively on philosophers such as Friedrich Nietzsche and the poet Friedrich Hölderlin. His influence extended beyond philosophy, impacting fields such as theology, art, architecture, artificial intelligence, cultural anthropology, design, literary theory, social theory, political theory, psychiatry, and psychotherapy. Heidegger's most famous work, Sein und Zeit (Being and Time), is considered one of the most important philosophical texts of the 20th century. This groundbreaking book, published in 1927, was instrumental in securing his appointment to the prestigious chair previously held by Edmund Husserl at the University of Freiburg. Heidegger's life remains controversial due to his association with the Nazi Party during World War II, a connection he never publicly expressed regret for or apologized for. This affiliation continues to be a subject of intense debate and criticism in discussions of his legacy.