PERSON@1 -LRB- NUMBER@1 June NUMBER@2 NUMBER@3 April NUMBER@4 -RRB- , commonly known as PERSON@2 , , was a MISC@1 existentialist philosopher , playwright , novelist , screenwriter , political activist , biographer , and literary critic .

PERSON@1 -LRB- June NUMBER@1 , NUMBER@2 -- April NUMBER@3 , NUMBER@4 -RRB- was a MISC@1 existentialist -LRB- way of thinking about human freedom -RRB- philosopher -LRB- person who thinks about ideas and ways of thinking -RRB- .
