The highest IQ scientists in history

This list covers the natural sciences: physics, chemistry, astronomy, biology and medicine. Pure mathematicians have their own ranking, and so do the psychologists who built IQ testing. Where Catharine Cox's 1926 study rated a scientist, the profile starts from her figure and adjusts it down for her high old scale; for scientists born after 1850, the number is an editorial marker built from the documented record and labelled as such.

The surprise for most readers is how few real test scores there are. Richard Feynman reported a school score of about 125. William Shockley and Luis Alvarez were screened for Lewis Terman's gifted study as children and not selected, then both won Nobel Prizes in physics. Those cases appear in the table with their documented numbers, and they are the best reminder on the page that an IQ test and a career in science measure different things.

The very top is held by people who combined theory with mathematics of their own making: Gauss, Laplace, Turing, Maxwell, Dirac and the quantum pioneers, with Galton's figure coming from Lewis Terman's 1917 study of his childhood. Cox's figures for the 17th and 18th centuries run highest, partly because their childhoods are well documented and partly because her scale was built that way. Read Cox-based and editorial figures as two different kinds of evidence, not as one continuous scale.

Many of the most important experimental scientists sit lower. Faraday left school at 13, Darwin was an average student, and Fleming's great discovery came from noticing a contaminated dish. Experimental science rewards patience, observation and luck as much as speed of reasoning, and the editorial markers try to respect that rather than inflate everyone to genius level.

Women are under-represented for reasons that have nothing to do with ability. Lise Meitner, Chien-Shiung Wu, Rosalind Franklin and Dorothy Hodgkin all worked against open exclusion, and most women of earlier centuries were kept out of science entirely. Their estimates are kept on the same rules as everyone else.

Each profile states its basis in plain words: a Cox 1926 figure from a secondary tabulation, a documented test, or an editorial marker with very low confidence. The range is the honest part. When two careful readers could place a scientist ten points apart, the range shows that, and the headline is only the midpoint we use for comparison.