James Madison — 4th President (1809–1817)

**James Madison** is the Father of the Constitution and the architect of American governance. Standing 5'4" and barely 100 pounds, he was the smallest president and the one who thought biggest about how power works, how it corrupts, and how to design systems that survive human frailty. His genius was structural — he designed a government of checks and balances not because he trusted people, but because he didn't.