The Smartest Man Who Ever Lived

A Brief History of William James Sidis

William James Sidis photographed at his Harvard graduation in 1914. Public Domain.

The average person’s IQ is between 90 and 109. People are considered geniuses if their IQ is over 140. Albert Einstein and Stephen Hawking had IQs of 160, Leonardo da Vinci 180, Isaac Newton 190.

As smart as those people were, there was one person who had an IQ estimated to be between 250 and 300, the average of three normal people combined.