Conversation so far:
Was Theodore Roosevelt active in any sports?
“I never was a champion at anything,” Theodore Roosevelt famously said, declaiming any particular athletic prowess.
Where was Theodore Roosevelt born?
Theodore Roosevelt Jr. was born on October 27, 1858, at 28 East 20th Street in Manhattan, New York City.
Who were Theodore Roosevelt's parents?
Theodore Roosevelt was born to socialite Martha Stewart Mittie Bulloch and businessman and philanthropist Theodore Roosevelt Sr.
What did Theodore Roosevelt's mother do?
Martha Bulloch Mittie Roosevelt was an American socialite

Question: What was his father known for?
Self-contained rewrite: What was Theodore Roosevelt's father known for?