Conversation so far:
In what ways did David McCullough experience growth?
Trying not to become Bad News McCullough, David McCullough decided to write about a subject showing people were not always foolish and inept or irresponsible.“
Where did David McCullough grow up as a youth?
David McCullough was born and raised in Pittsburgh.
How long did David McCullough live in Pittsburgh?
David McCullough lived in Pittsburgh until 1951 when he began attending Yale University.
Where did David McCullough's parents come from?
David McCullough's parents are of Scots-Irish descent.
Where did David McCullough go to school?
David McCullough went to school at Linden Avenue Grade School and Shady Side Academy.

Question: When did he graduate?
Self-contained rewrite: When did David McCullough graduate?