Important scientists

 

J

 François Jacob (1920 - )  biologist  feedback, gene expression (with Lwoff, Monod)
 Karl Jansky (1905 - 1950)  physicist  inventor of radio astronomy

 Erik Jarvik

(1907 - 1998)  paleontologist  fossil fish

 Harold Jeffreys

(1891 - 1989)  mathematician  probability theory

 Fleeming Jenkin

(1833 - 1885)  engineer  telephone cable laying

 Edward Jenner

(1749 - 1823)  physician  inventor of vaccination, father of immunology
 Hans Jensen (1907 - 1973)  physicist  nuclear shell model (with Goeppert-Mayer)
 Niels Jerne (1911 - 1994)  immunologist  monoclonal antibodies (with Köhler, Milstein)

 Donald Johanson

(1943 - )  anthropologist  discovered Lucy AL 288-1 Australopithecus fossils

 Irène Joliot-Curie

(1897 - 1956)  physicist  induced radioactivity (with husband Frédéric)

 John Joly

(1857 - 1933)  physicist  radiotherapy
 Brian Josephson (1940 - )  physicist  electron tunnelling (with Esaki, Giaever), Josephson effect

 James Joule

(1818 - 1889)  physicist  thermodynamics
 Carl Jung (1875 - 1961)  psychiatrist  analytical psychology, dream analysis