Jean Paul Sartre (1905-1980) popularized the philosophy which he called existentialism. Sartre's version of existentialism taught (consistent with his atheism) that life has no external meaning at all and that the moral obligation of every person was to find and define the meaning of their own life (lest life be altogether meaningless)[1].
Sartre published a number of philosophical works including:
Transcendence of the Ego, published in 1936
The Psychology of Imagination, published in 1940
Being and Nothingness, published in 1943
The Age of Reason, published in 1945
Search for a Method, published in 1957
Critique of Dialectical Reason, published in 1960 (including Search for a Method as its introduction)
Notebooks for Ethics, published posthumously, but written between 1947 and 1948.
Sartre also wrote a number of works of fiction based on his philosophical ideas, these include:
Nausea, published in 1938
The Wall and Other Stories, published in 1939
The Flies, published in 1942
No Exit, published in 1942
In fact, Sartre’s writing was so well received that, in 1964, he was awarded the Nobel Prize for literature, which he declined. [2]
Sartre fought in the French resistance in World War II and worked on an underground French paper of the time.
Towards the end of his life he expressed sympathy with the terrorists who kidnapped and killed Israelis during the 1972 Olympics, asserting that it was “perfectly scandalous” how the French press criticized the terrorism. He described terrorism as “a terrible weapon, but the oppressed poor have no others”.