9. James Garfield
Source: Wikipedia.
James Garfield was the 20th US president, serving for less than a year before being assassinated in 1882.
A graduate of Williams College, Garfield had an IQ of 148, according to Simonton’s estimates. Although his presidency was short, Garfield had a big impact. He re-energized the US Navy, did away with corruption in the Post Office Department, and appointed several African-Americans to prominent federal positions, according to White House records. He was assassinated by Charles J. Guiteau on July 2, 1881, just 200 days after taking office.