The people below are a history set for nature and nurture, diverse in country and gender, not a league table.
Years and countries are real. “Why” is a file label, not a rank. No group IQ story is licensed by any of these lives.
Exemplars
- Francis Galton 1822–1911 · United Kingdom
Named the contrast Coined the English slogan and built pedigree science that later eugenics weaponised. Read as history, not as a manual.
- Charles Spearman 1863–1945 · United Kingdom
Factor g Showed that cognitive tests intercorrelate. The math is not a racial hierarchy.
- Barbara Burks 1902–1943 · United States
Early adoption design Tried to unconfound home and pedigree in California data — a design ancestor, not a final word.
- Lev Vygotsky 1896–1934 · Soviet Union
Social development Made assisted performance the unit of teaching. A nurture mechanism with theoretical teeth.
- Jean Piaget 1896–1980 · Switzerland
Stage theory Mapped how thinking changes with age. Stages are not talent ranks.
- Sandra Scarr 1936–2021 · United States
Good-enough environments Argued many homes are functionally similar for some outcomes; schools still dispute the threshold.
- Thomas Bouchard 1937– · United States
Reared-apart twins Led the Minnesota project that made genetic influence a 1980s media fact.
- Robert Plomin 1948– · United Kingdom
Behavioural genetics Long-running twin and genomic programme. Useful on methods; not a licence for classroom DNA gates.
Nature and nurture: eight lives, not a ranking. Read them as files, not as a hierarchy of peoples.