Arne Dekke Eide Næss (born January 27, 1912) is widely regarded as the foremost Norwegian philosopher of the 20th century, and is the founder of deep ecology. His philosophical work focused on Spinoza, Buddhism and Gandhi. Næss combined his ecological vision with Gandhian nonviolence and on several occasions participated in direct action. In 1970, together with a large number of demonstrators, he chained himself to rocks in front of Mardalsfossen, a waterfall in a Norwegian fjord, and refused to descend until plans to build a dam were dropped. Though the demonstrators were carried away by police and the dam was eventually built, the demonstration launched a more activist phase of Norwegian environmentalism.
Næss had been a minor political candidate for the Norwegian Green Party and in 1939 he was the youngest person to be appointed full professor at the University of Oslo and the only professor of philosophy in the country at the time. In 1996, he won the Swedish Academy Nordic Prize, known as the 'little Nobel'. In 2005 he was decorated as a Commander with Star of the Royal Norwegian Order of St. Olav for socially useful work.