Martin Heidegger (1889 - 1976) was a German philosopher and a seminal thinker in the Contential philosophical tradition.
His first academic book, Being and Time, was published in 1927. It seeks to examine the concept of Being, which Heidegger maintains that Ancient Greek philosophy has avoided. It doing so he revives ontology, which is the philosophical study of being, last examined during the life of Avicenna (c. 980 - 1037).
One of his later works, The Question Concerning Technology, published in 1954, discusses the essence of technology. Heidegger questions the essence of technology to prepare a free relationship to it.