Lewis Terman IQ

Lewis Terman was born on an Indiana farm in 1877, the twelfth of fourteen children. He trained as a teacher, then earned a doctorate at Clark University in 1905 with a study of bright and dull boys. At Stanford he revised Binet's test as the Stanford-Binet in 1916, introducing the IQ score to America. In 1921 he began a lifelong study of about 1,500 gifted California children, the "Termites". He also promoted eugenics. He died in 1956.

No score for him is published. LifeScore lists about 140 as an editorial marker, range 125 to 155. It rests on his doctorate, the Stanford-Binet and the organisation of a study that followed about 1,500 children for decades.

Children who scored about 135 or above grew up healthier and more successful than average, overturning the myth of the sickly genius. But none became a world-class genius, and two children screened out, Shockley and Alvarez, won Nobel Prizes. High IQ predicted success, not eminence.

The nickname for the roughly 1,500 children, born around 1910, selected for Terman's Genetic Studies of Genius. They were followed through adulthood, and researchers continued tracking survivors into the 21st century.

Terman thought in large samples and long time spans. His idea of following gifted children for life was ambitious and influential. His blind spot was confidence: he treated test scores as a measure of worth, which his own data partly contradicted.

What supports it

• The Stanford-Binet and its manuals are published.
• The Genetic Studies of Genius ran to five volumes in his lifetime.
• Records show Shockley and Alvarez were screened and not selected.

What it cannot prove

• No IQ score of this researcher has been published, so the page cannot apply their own method to them.
• His eugenic views shaped his interpretations and are rejected today.
• An editorial marker is a comparison aid built from achievement, not a measurement, and two careful readers could place it ten points apart.

Lewis Terman's IQ is represented here by a retrospective estimate of 140, not a verified test result. Lewis Terman is best known for exceptional persistence. The useful question is what the surviving evidence shows, not whether a precise modern score can be recovered.

Industrious, confident and paternal. A builder of tests who believed too firmly in what they measured.

The dominant archetype here is The Tester. This archetype shapes decision patterns: what feels natural, what creates friction, and what blind spots tend to emerge.

Estimated IQ is 140. This is a rough estimate based on documented accomplishments and contemporary accounts, not a literal measurement.

His son Frederick Terman, a Stanford engineering dean, is often called a father of Silicon Valley.

Lewis Terman's estimate of 140 falls in the genius level IQ range. Want your own number rather than Lewis's? Take the free IQ test or the quick IQ test. See what an IQ of 140 means, place it on the IQ chart or check how rare it is with the IQ rarity calculator.