George Beadle

George Wells Beadle was born October 22, 1903, on a farm outside Wahoo, Nebraska, and expected to spend his life running it. His father wanted him to take over the land, and Beadle nearly did, until a high school teacher talked him into the University of Nebraska's college of agriculture instead. There he found genetics through corn breeding, earning a bachelor's degree in 1926 and staying on for graduate research into maize chromosomes. He left for Cornell that same year, took a master's degree in 1927 and a doctorate in 1931 with a dissertation on chromosome behavior in Zea mays, then carried that training into a fellowship at Caltech, where Thomas Hunt Morgan's fly-genetics laboratory was rewriting what a gene was thought to do.

At Stanford in the early 1940s, Beadle and the biochemist Edward Tatum ran a study that reset genetics around a single clean claim. They irradiated the bread mold Neurospora crassa, produced mutants that had lost the ability to make specific vitamins and amino acids, and traced each defect to damage in a single gene, showing that genes act by directing the manufacture of particular enzymes. The one gene-one enzyme hypothesis gave molecular biology its founding sentence and its Nobel Prize, shared with Tatum and Joshua Lederberg in 1958. Beadle returned to Caltech in 1946 to chair its biology division, then left research administration altogether in 1961 to become president of the University of Chicago, where he spent seven years running a university rather than a laboratory before retiring in 1968.

The scientist who proved a single damaged gene could silently disable one enzyme and nothing else spent his last professional years running an institution instead of a bench, costing him the research career at its peak. Colleagues at Chicago found a careful experimentalist thrust into faculty revolts, budget fights, and the campus politics of the late 1960s, work he had neither trained for nor enjoyed; he stepped down in 1968, worn down by it. His personal life carried a quieter fracture too: his first marriage ended in divorce, and he raised his son David largely apart from the boy, who settled permanently in the Netherlands. Even his signature discovery had already been narrowed by the time he won it: a gene, later research showed, does not always specify one enzyme in the simple way the prize-winning slogan implied.

Beadle died June 9, 1989, in Pomona, California, after some years of declining health that included Alzheimer's disease, the geneticist's own mind eventually working against the biochemistry he had spent his career explaining. His and Tatum's mold experiments are now treated as the moment genetics became a chemical science rather than a purely observational one, the direct ancestor of the molecular biology that identified DNA's role within a decade of their Nobel Prize. Nebraska remembers him with a middle school and a research center bearing his name; the Genetics Society of America still gives an annual Beadle Award for lifetime service to the field he helped turn from breeding charts into biochemistry.

George Beadle's life against the full span of the corpus.

• One gene-one enzyme hypothesis discovery
  With Edward Tatum, using x-ray-mutated Neurospora crassa 1941
• Nobel Prize in Physiology or Medicine other
  Shared with Edward Tatum and Joshua Lederberg 1958
• Caltech Division of Biology company
  Chaired and rebuilt the division after returning from Stanford 1946
• The Language of Life book
  Popular-science account of genetics, co-written with Muriel Beadle 1966

• October 22, 1903 aged 0 Born in Wahoo, Nebraska
• 1926 aged ~23 Earns his bachelor's degree at the University of Nebraska
• 1931 aged ~28 Earns his doctorate at Cornell University
• 1937 aged ~34 Joins Stanford University, where he begins working with Edward Tatum
• 1941 aged ~38 Publishes the Neurospora experiments establishing one gene-one enzyme
• 1946 aged ~43 Returns to Caltech to chair its biology division
• 1958 aged ~55 Wins the Nobel Prize in Physiology or Medicine
• 1961 aged ~58 Becomes president of the University of Chicago
• June 9, 1989 aged 85 Dies in Pomona, California

• Linus Pauling 1901–1994
  Chemist and peace activist who won two unshared Nobel Prizes in Chemistry and Peace. colleague at Caltech
• James Watson 1928–2025
  Co-discoverer of the DNA double helix structure, earning a Nobel Prize in Physiology or Medicine. built on his gene-enzyme framework
• Barbara McClintock 1902–1992
  Cytogeneticist who discovered transposable elements and won the Nobel Prize in Physiology or Medicine. fellow maize geneticist
• Milton Friedman 1912–2006
  Nobel Prize-winning economist whose free-market ideas profoundly influenced American economic policy. faculty colleague as University of Chicago president