#23: William Henry Harrison
Estimated IQ: 124
William Henry Harrison received a solid classical education at Hampden–Sydney College, where he studied Latin, Greek, and history before turning to a military career. His intelligence was practical and grounded—he combined intellectual curiosity with discipline, and he remained a thoughtful observer of both politics and frontier life throughout his years in public service.

Harrison had little time to demonstrate his intellect—his term lasted only a month before his death. Still, his speeches and correspondence reflected a clear, reasoned thinker who valued civic virtue and learning. His education and composure hinted at a leadership style both principled and informed.
