Conversation so far:
What was Isaac Asimov's first job?
Philadelphia Navy Yard's Naval Air Experimental Station.
What was his age of starting school?
New York City public schools from age 5.
What school did he attend?
Boys High School in Brooklyn.
What age did he graduate?
15.
What college did he attend?
Seth Low Junior College.
What is that apart of?
Columbia University.
Where is this located?
Downtown Brooklyn.
what degree did he go for?
Originally a zoology major.

Question: Why did he change?
Self-contained rewrite: Why did Isaac Asimov change his major from zoology?