Conversation so far:
Where is Dr. Seuss from?
Theodor Seuss Geisel was born and raised in Springfield, Massachusetts.
How did Dr. Seuss start?
What did Dr. Seuss do at Dartmouth College?
At Dartmouth, Theodor Seuss Geisel joined the Sigma Phi Epsilon fraternity and the humor magazine Dartmouth Jack-O-Lantern, eventually rising to the rank of editor-in-chief.

Question: what did he study there?
Self-contained rewrite: What did Dr. Seuss study at Dartmouth College?