Fred Conrad Koch
A pioneering biochemist whose isolation of testosterone unlocked the study of male hormones and revolutionized endocrinology.
1876–1948 (age 72)·Birthday: May 16·The Gilded Age
Biography
Frederick Conrad Koch was a Chicago-born scientist who turned his meticulous attention to the mysterious chemical messengers of the body. At the University of Chicago, where he spent the bulk of his career, Koch led a relentless pursuit to isolate the active principle of the male sex hormone from animal testes. In a landmark collaboration with the pharmaceutical firm Armour and Company, his team processed tons of bull testicles, ultimately crystallizing pure testosterone. This wasn't merely a laboratory triumph; it provided the essential raw material for physiological research and medical therapy, opening the door to understanding androgen function. Koch's rigorous, industrial-scale approach set a new standard for biochemical isolation. His legacy is cemented not only in the vials of hormone he produced but in the prestigious award named in his honor by the Endocrine Society, recognizing a lifetime of foundational work.
The Gilded Age
1860–1882
Born during or after the Civil War, they built industrial America — the railroads, the steel mills, the first skyscrapers. An era of massive wealth, massive inequality, and the belief that the future belonged to whoever could build it fastest.
Fred was born in 1876, placing them squarely in The Gilded Age. The events that shaped this generation — world wars, depression, and rapid industrialization — shaped the world they entered and the choices available to them.
#1 When Fred Was Born
The biggest hits of 1876
Fred's Life & Times
The world at every milestone
1876Born
President: Ulysses S. Grant
1881Started school
President: Chester A. Arthur
1889Became a teenager
Eiffel Tower opens in Paris
President: Benjamin Harrison
1892Could drive
President: Benjamin Harrison
1894Could vote
President: Grover Cleveland
1897Turned 21
President: William McKinley
1906Turned 30
San Francisco earthquake devastates the city
President: Theodore Roosevelt
1916Turned 40
The Battle of the Somme claims over a million casualties
President: Woodrow Wilson
1926Turned 50
Robert Goddard launches the first liquid-fueled rocket
President: Calvin Coolidge"Baby Face" — Jan Garber
1936Turned 60
Jesse Owens wins four golds at the Berlin Olympics
Gas: $0.19/galPresident: Franklin D. Roosevelt"The Way You Look Tonight" — Fred AstaireBest Picture: The Great Ziegfeld
1946Turned 70
United Nations holds its first General Assembly
Gas: $0.21/galHome: $5,150Min wage: $0.40/hrPresident: Harry S. Truman"Prisoner of Love" — Perry ComoBest Picture: The Best Years of Our Lives
1948Died at 72
Israel declares independence; Berlin Blockade begins
Gas: $0.26/galHome: $7,450Min wage: $0.40/hrPresident: Harry S. Truman"Twelfth Street Rag" — Pee Wee HuntBest Picture: Hamlet
Key Achievements
- Led the University of Chicago research team that first isolated pure testosterone in 1935.
- Served as the 19th President of the Endocrine Society, shaping the field's direction.
- Held the position of Chairman of the Department of Biochemistry at the University of Chicago from 1936 to 1941.
- Directed biomedical research at Armour and Company, bridging academic science and industrial application.
Did You Know?
The Endocrine Society's highest honor, the Fred Conrad Koch Award, was established in his name in 1957.
His initial degree was in chemistry from the University of Illinois in 1899.
The process to isolate testosterone required extracting material from approximately 40 pounds of bull testicles to yield 20 milligrams of the hormone.
“We must separate the active principle from the testicular material to understand its true function.”
