Næss was a Norwegian philosopher, known foremost as the founder of the concept Deep Ecology Næss combined his ecological vision with Gandhian nonviolence and on several occasions participated in direct action events. He was the youngest person to ever be promoted to professor at Oslo University (27), a position he inhabited from 1939 to 1970. Næss' main philosophical work from the 1950s was entitled Interpretation and Preciseness. . He later developed the conclusions in that book into a simplified, practical textbook, entitled Communication and Argument, which became a valued introduction to pragmatics or rather "language logic", and was thus used over many decades as a sine qua non for the preparatory examination at the University of Oslo, later known as "Examen Philosophicum". From the 1960s and forward his work came to be more and more focused on what would later be known as deep ecology. The name was first introduced to the public by Næss in 1972 during a lecture and was later explained further in The Shallow and the Deep Long-Range Ecology Movement: A Summary (published 1973 in the Inquiry journal).