Possible Clues:

• False arrest of French intellectual
• 'Le Mur' writer
• Existentialist playwright
• He discussed philosophy in prestigious Art Review
• Author who declined the Nobel Prize
• Philosopher's singular skill with religious subject
• He declined a Nobel Prize in Literature
• Longtime companion of de Beauvoir
• 'The Transcendence of the Ego' writer
• 'Hell is other people' French dramatist