Martin Heidegger

Heidegger's Being and Time is one of the most important philosophical works of the 20th century. He sought to reawaken the question of Being — what it means for something to exist — which he believed Western philosophy had forgotten.

His concept of Dasein (being-there) emphasizes that human existence is always situated in a world of practical concerns. He explored themes of authenticity, mortality, and technology's impact on human understanding.