Although James Madison’s signature doesn’t adorn the Declaration of Independence, as the nation’s fourth President and chief architect of the Bill of Rights, he’s widely regarded as one of the most influential Founding Fathers. Madison had a large impact on early U.S. history even though he is also the country’s shortest President thus far, standing just 5 feet and 4 inches tall. That makes Madison a full foot shorter than America’s tallest President, Abraham Lincoln (and no, that height doesn’t include Lincoln’s signature stovepipe hat).