#18 John Quincy Adams – 168.8 IQ
John Quincy Adams boasted an impressively high IQ score of 168.8. He received his law degree from Harvard University and reportedly spoke at least four different languages fluently! He also was a talented statesman and representative of the United States in international affairs. There are lots of other Harvard grads on this list that you would never have expected to have such high IQs – just keep reading!