Albert Claude
August 24, 1899 — May 22, 1983
Albert Claude was a Belgian-American cell biologist who, through his development of techniques for cell fractionation and his pioneering application of the electron microscope to the study of living cells, founded the field of modern cell biology and won the Nobel Prize in Physiology or Medicine in 1974.
An Unconventional Education
Born on August 24, 1899 in Longlier, Belgium (now part of Luxembourg), Claude had an unconventional early education — he largely educated himself while caring for a sick uncle and only received a formal higher education later than most, earning his medical degree from the University of Liège in 1928. The same year he enrolled at the Kaiser Wilhelm Institute in Berlin for advanced study, then moved to the United States in 1929 to take up a position at the Rockefeller Institute for Medical Research in New York. He would remain at Rockefeller for two decades, and it was there that he made the discoveries that would define his legacy. He became a naturalized American citizen in 1941.
Founding Cell Biology
In the 1930s, Claude developed a technique called differential centrifugation, which allowed him to isolate specific components of the cell by spinning homogenized tissue at different speeds. Through this method he identified the mitochondria (previously described but whose function was unknown), isolated ribosomes (which he called "microsomes"), and identified the endoplasmic reticulum. Then, in a revolutionary move, he collaborated with engineers to apply the electron microscope — then a brand-new instrument — to biological samples. His 1945 paper presenting the first electron micrographs of cells showed for the first time the internal structure of cells in fine detail, revealing organelles whose existence had only been inferred. He shared the 1974 Nobel Prize in Physiology or Medicine with Christian de Duve and George Emil Palade for these foundational contributions to cell biology.
Did You Know?
Despite lacking a high school diploma, Claude was admitted to the University of Liège medical program through a special exemption based on evidence of equivalent knowledge — itself an extraordinary feat. His Nobel lecture, delivered in 1974, is notable for its philosophical scope, reflecting on the meaning of science and the nature of life rather than merely summarizing his technical achievements.
Later Career and Legacy
After World War II, Claude returned to Belgium, where he directed the Jules Bordet Institute for Cancer Research and continued research until late in life. He remained an active scientist into his seventies and was awarded the Nobel Prize at the age of 74. He died on May 22, 1983 in Brussels at age 83. The laboratory techniques he developed — cell fractionation and preparation for electron microscopy — are so foundational to modern biology that they are now standard tools taught in every university biology program in the world. Without his work, the molecular biology revolution of the latter 20th century would have had far less to build on.