Conversation so far:
Where was David McCullough born?
David McCullough was born in the Point Breeze neighborhood of Pittsburgh, Pennsylvania, the son of Ruth and Christian Hax McCullough.
What did David McCullough's parents try next after his birth to educate him
David McCullough's parents and his grandmother, who read to him often, introduced him to books at an early age
What did David McCullough's parents say to him in discussions to stimulate his burgeoning young mind
David McCullough's parents often talked about history, a topic he says should be discussed more often.
What was David McCullough's next work after becoming a young man
David McCullough said that it was a privilege to study English at Yale because of faculty members such as John O'Hara, John Hersey, Robert Penn Warren, and Brendan Gill.
What was David McCullough's next choice in companionship after the Yale English faculty?
David McCullough occasionally ate lunch with the Pulitzer Prize-winning novelist and playwright Thornton Wilder.
What did David McCullough and Thornton Wilder joke about
Thornton Wilder, says David McCullough, taught him that a competent writer maintains an air of freedom in the storyline, so a reader won't anticipate the outcome, even in non-fiction.

Question: What did he read about?
Self-contained rewrite: What did David McCullough read about while at Yale?