Possible Clues:

• Russo of 'The Intern'
• M. Descartes
• Monsieur Descartes
• Russo of 'Thor'
• Magritte or Russo
• 1968 Nobel Peace Prize winner Cassin
• Descartes of philosophy
• Kevin's "Tin Cup" co-star
• "In the Line of Fire" actress Russo
• Auberjonois or Russo