Conversation so far:
When was Fred Rogers born?
Fred Rogers was born March 20, 1928.
Where was Fred Rogers born?
Fred Rogers was born in Latrobe, Pennsylvania.
Who were Fred Rogers' parents?
Fred Rogers' parents were James and Nancy Rogers.
Did Fred Rogers have any siblings?
Fred Rogers had a sister, Elaine, whom the Rogerses adopted when he was 11 years old.
Where did Fred Rogers go to school?
Fred Rogers attended Latrobe High School, Dartmouth College, Rollins College, and Pittsburgh Theological Seminary.

Question: what did he study?
Self-contained rewrite: What did Fred Rogers study?