Conversation so far:
What did Epstein do for the Cubs?
He became President of Baseball Operations for the Chicago Cubs.
When did Theo Epstein join the Cubs?
On October 12, 2011, Epstein agreed to a five-year contract worth $18.5 million with the Chicago Cubs.
What did Theo Epstein do for the Cubs (positively)?
The Cubs finished the 2016 season with a 103–58 record, the best in MLB and their best since the 1910 season.

Question: did the cubs ever win the championship under THeo?
Self-contained rewrite: Did the Cubs ever win the championship under Theo Epstein?