Instructions 20Q Game: These are similar to full games, but for quizzes larger than 20 questions it will randomly select 20 questions from within the set. This is a quick way to get in some studying of a topic.     
Identify the following philosopher:

(1903-1957) Hungarian-American mathematician and polymath. Said to be "the last representative of the great mathematicians". Published over 150 papers in his life: ~60 in pure mathematics, ~60 in applied mathematics, ~20 in physics.
John Stuart Mill
Peter Abelard
John von Neumann
Jean-Paul Sartre