Conversation so far:
What was Allan Bloom's first notable role?
Allan Bloom became famous for his criticism of contemporary American higher education, with his views being expressed in his bestselling 1987 book, The Closing of the American Mind.
Did allan bloom enjoy his time in Europe?
What was Allan Bloom's first position in the US?
Upon returning to the United States in 1955, Allan Bloom taught adult education students at the University of Chicago.
What year did Allan bloom teach at University  of Chicago?
Upon returning to the United States in 1955, Allan Bloom taught at the University of Chicago.

Question: How long was his tenure?
Self-contained rewrite: How long was Allan Bloom's tenure in the Yale?