Conversation so far:
Where did Murray Rothbard attend high school?
Murray Rothbard attended Birch Wathen, a private school in New York City.
Did Murray Rothbard further his education in college?
Murray Rothbard attended Columbia University.
Did Murray Rothbard do well with his education?
Murray Rothbard received a Bachelor of Arts degree in mathematics in 1945 and eleven years later his PhD in economics in 1956.

Question: Did he use his degree in mathematics?
Self-contained rewrite: Did Murray Rothbard use his degree in mathematics?