Heidegger's first academic book, Being and Time (German title: Sein und Zeit), was published in 1927.
He had been under pressure to publish in order to qualify for Husserl's chair at the University of Freiburg; he dedicated the book to Husserl and the success of the work ensured his appointment to the post.

In Being and Time, Heidegger investigates the question of being by asking about the being for whom being is a question.
Heidegger names this being Dasein (see above), and he pursues his investigation through themes such as mortality, care, anxiety, temporality, and historicity.
It was Heidegger's original intention to write a second half of the book, consisting of a "Destruktion" of the history of philosophy—that is, the transformation of philosophy by re-tracing its history—but he never completed this project.
Heidegger's first academic book, Being and Time (German title: Sein und Zeit), was published in 1927. He had been under pressure to publish in order to qualify for Husserl's chair at the University of Freiburg; he dedicated the book to Husserl and the success of the work ensured his appointment to the post.
In Being and Time, Heidegger investigates the question of being by asking about the being for whom being is a question. Heidegger names this being Dasein (see above), and he pursues his investigation through themes such as mortality, care, anxiety, temporality, and historicity. It was Heidegger's original intention to write a second half of the book, consisting of a "Destruktion" of the history of philosophy—that is, the transformation of philosophy by re-tracing its history—but he never completed this project.
Martin Heidegger