Who is Martin Heidegger from The Myth of Sisyphus and Other Essays and what is their importance?

Martin Heidegger is a German existentialist philosopher who identifies the chief driving force behind mankind as a kind of supernatural "anxiety"—a lack of certainty about the nature of the world which ultimately stems from its mystery and impossibility to completely comprehend. Without explaining how, Camus states that Heidegger, like Husserl and Kierkegaard, ultimately departs from the absurd principles with which he begins.