Important scientists

 

K

 Michio Kaku

(1947 - )  theoretical physicist  string theory; see also own website
 Theodor Kaluza (1885 - 1954)  physicist  5th dimension, Kaluza-Klein theory (with Klein)
 Eric Kandel (1929 - )  neuroscientist  dopamine, Parkinson's disease, signal transduction (with Carlsson, Greengard)
 Charles Kao 1933 - )  engineer  fiber optics, broadband internet
 Pyotr Kapitsa (1894 - 1984)  physicist  low temperature physics, superfluidity, liquid helium
 Jerome Karle (1918 - )  physicist  phase problem in X-ray crystallography (with Hauptmann)
 Paul Karrer (1889 - 1971)  biochemist  chemical structure, vitamin A, vitamin C, flavins
 Alfred Kastler (1902 - 1984)  physicist  optical pumping, quantum mechanics
 Bernard Katz (1911 - 2003)  neurophysiologist  neurotransmitters (with von Euler, Axelrod), synapse

 Friedrich Kekule

(1829 - 1896)  chemist  chemical structure drawing

 William Kelvin

(1824 - 1907)  physicist  Absolute Zero
 Edward Kendall (1886 - 1972)  chemist  adrenal cortex hormones (with Hench, Reichstein)
 Henry Kendall (1926 - 1999)  physicist  protons, quarks, quark model (with Friedman, Taylor)
 John Kendrew (1917 - 1997)  biochemist  protein structure, hemoglobin, heme proteins (with Perutz)

 Johannes Kepler

(1571 - 1630)  astronomer  planetary motion
 Wolfgang Ketterle (1957 - )  physicist  Bose-Einstein condensate (with Cornell, Wieman)

 Har Khorana

(1922 - )  biochemist  protein biosynthesis, tRNA, genetic code (with Holley, Nirenberg)

 Muhammad al Khwarizmi

(780 - 850)  early mathematician  founder of algebra
 Jack Kilby (1923 - 2005)  physicist  microchip (integrated circuit), handheld calculator, thermal printer

 Kamoya Kimeu

(1940 - )  anthropologist  primate fossil collector

 Gustav Kirchhoff

(1824 - 1887)  physicist  black body radiation, Kirchhoff's Laws
 Oskar Klein (1894 - 1977)  physicist  5th dimension, Kaluza-Klein theory (with Kaluza)
 Klaus von Klitzing (1943 - )  physicist  quantum Hall effect, von Klitzing constant
 Aaron Klug (1926 - )  chemist  electron crystallography
 William Knowles (1917 - )  chemist  Noyori asymmetric hydrogenation (with Noyori)
 Makoto Kobayashi (1944 - )  physicist  CP violation, spontaneous symmetry breaking (with Maskawa)

 Robert Koch

(1843 - 1910)  founder of bacteriology  discovered bacteria for anthrax, tuberculosis, cholera
 Emil Kocher (1841 - 1917)  physician  thyroid gland

 Ralph von Koenigswald

(1902 - 1982)  anthropologist  primate evolution

 Friedrich Koenig

(1774 - 1833)  inventor  inventor of high-speed printing press
 Georges Khler (1946 - 1995)  immunologist  monoclonal antibodies (with Jerne, Milstein)
 Walter Kohn (1923 - )  physicist  density functional theory

 Wladimir Kppen

(1816 - 1940)  meteorologist  climate classification
 Arthur Kornberg (1918 - 2007)  biochemist  DNA replication, enzyme chemistry (with Ochoa)
 Roger Kornberg (1947 - )  biochemist  DNA transcription
 Masatoshi Koshiba (1926 - )  physicist  solar neutrinos, Homestake experiment (with Davis, Giacconi)
 Albrecht Kossel (1853 - 1927)  physician  cell biology, proteins, histidine, agmatine

 Emil Kraepelin

(1856 - 1926)  psychiatrist  founder of modern psychiatry
 Edwin Krebs (1918 - 2009)  biochemist  reverse protein phosphorylation (with Fischer)

 Hans Krebs

(1900 - 1981)  biochemist  Krebs (or citric acid) cycle (with Lipmann)

 Gerhard Kremer

(1512 - 1594)  map maker  developed Mercator projection of Earth
 Herbert Kroemer (1928 - )  computer engineer  semiconductor devices, optoelectronics (with Alferov)
 August Krogh (1874 - 1949)  physiologist  capillary regulation in skeletal muscle, Krogh principle
 Harry Kroto (1939 - )  chemist  fullerene (with Curl, Smalley)
 Richard Kuhn (1900 - 1967)  biochemist  carotenoids, vitamins, Soman
 Polycarp Kusch (1911 - 1993)  physicist  hydrogen spectrum, Lamb shift, electron properties (with Lamb)