Conversation so far:
What role did Theo Epstein play with the Red Sox?
Theo Epstein was General Manager of the Boston Red Sox.
What year did Theo Epstein become president?
Theo Epstein became president of the Cubs in 2011. He was GM of the Red Sox from 2001-2005 and 2006-2011.

Question: How long did Epstein work with the Red Sox?
Self-contained rewrite: How long did Epstein work with the Red Sox?