10,219 articles
Johan Arvid Hedvall
Johan Arvid Hedvall (1888–1974) was a Swedish chemist at Chalmers who showed that solids react below their melting points, giving his name to the Hedvall effect.
Johan Frederik Steffensen
Johan Frederik Steffensen (1873–1961) was a Danish mathematician and actuary who began as a jurist and became professor of actuarial mathematics at Copenhagen, known for Steffensen's method and inequality.
Johan Herman Lie Vogt
Johan Herman Lie Vogt (1858–1932) was a Norwegian geologist and metallurgist who applied physical chemistry to magmatic melts and helped establish the magmatic-segregation hypothesis for nickel-copper sulfide ores.
Johan Jacob Seidel
Johan Jacob Seidel (1919–2001) was a Dutch mathematician who founded the mathematics department of TU Eindhoven and was known for Seidel matrices, switching, and strongly regular graphs.
Johan Jensen (Danish mathematician)
Johan Jensen (1859–1925) was a Danish telephone engineer and self-taught mathematician, chief engineer of the Copenhagen Telephone Company, remembered for Jensen's inequality and Jensen's formula in complex analysis.
Johan Pieter Wibaut
Johan Pieter Wibaut (1886–1967) was a Dutch organic chemist, professor of organic chemistry at the University of Amsterdam from 1925 to 1956 and wartime rector magnificus.
Johan Rockström
Johan Rockström is a Swedish scientist best known as lead author of the planetary boundaries framework and director of the Potsdam Institute for Climate Impact Research.
Johann Georg Hagen
Johann Georg Hagen was an Austrian-born Jesuit priest and astronomer who directed the Georgetown University Observatory from 1888 and the Vatican Observatory in Rome from 1906 until his death in 1930.
Johann Heinrich Louis Krüger
Johann Heinrich Louis Krüger (1857–1923) was a German geodesist and mathematician whose 1912 monograph turned Gauss's ellipsoidal mapping into the practical Gauss–Krüger projection, the basis of UTM.
Johann Nikuradse
Johann Nikuradse was a fluid dynamicist who took his doctorate under Ludwig Prandtl at Göttingen in 1923; his 1932–1933 pipe-friction experiments became the classical dataset of rough-wall turbulence.
Johann Radon
Johann Radon (1887–1956) was an Austrian mathematician known for the Radon transform, which underlies computed tomography, and the Radon–Nikodym theorem, a cornerstone of measure theory and probability.
Johann Wilhelm Hittorf
Johann Wilhelm Hittorf (1824–1914) was a German physicist at the University of Münster who discovered cathode rays in 1869 and established the transport numbers of ion migration in electrolysis.
Johanna Blake
Johanna M. Blake is an American research hydrologist and geochemist at the USGS New Mexico Water Science Center in Albuquerque, who received a 2025 Presidential Early Career Award.
Johannes A. Lercher
Johannes A. Lercher is an Austrian catalysis scientist who directs the Institute for Integrated Catalysis at Pacific Northwest National Laboratory and holds a chemistry chair at the Technische Universität München.
Johannes C. Mol
Johannes C. Mol is a Dutch chemist at the University of Amsterdam whose 1968 isotope-labeling experiments on olefin metathesis are cited by the Nobel Committee.
Johannes Diderik van der Waals
Johannes Diderik van der Waals was a Dutch physicist who won the 1910 Nobel Prize in Physics for his equation of state for gases and liquids.
Johannes Geiss
Johannes Geiss (1926–2020) was a German-Swiss experimental physicist at the University of Bern, best known for leading the Apollo Solar Wind Composition experiment on the Moon.
Johannes Hjelmslev
Johannes Hjelmslev, born Johannes Trolle Petersen, was a Danish mathematician, professor at the University of Copenhagen from 1917, known for his 1907 axiomatic reconstruction of plane geometry.
Johannes Kepler
Johannes Kepler was a German astronomer and mathematician, 1571 to 1630, whose three laws of planetary motion, drawn from Tycho Brahe's observations, later underpinned Newton's theory of gravitation.
Johannes Martin Bijvoet
Johannes Martin Bijvoet (1892–1980) was a Dutch crystallographer who in 1951 determined the first absolute configuration of an organic molecule by X-ray diffraction, using anomalous scattering.
Johannes Mollerup
Johannes Mollerup (1872–1937) was a Danish mathematician, professor at the Technical University of Denmark from 1916, known for the Bohr–Mollerup theorem and the Danish analysis textbook he wrote with Harald Bohr.
Johannes Nicolaus Brønsted
Johannes Nicolaus Brønsted was a Danish physical chemist and professor at Copenhagen who defined acids as proton donors and bases as proton acceptors in 1923.
Johannes Rydberg
Johannes Robert Rydberg (1854–1919) was a Swedish physicist at Lund University whose 1890 formula for spectral series, with the Rydberg constant, underlies Bohr's 1913 atomic model.
Johannes Stark
Johannes Stark (1874–1957) was a German experimental physicist who won the 1919 Nobel Prize in Physics for discovering the splitting of spectral lines in electric fields, the Stark effect.
Johannes V. Barth
Johannes V. Barth, born 1962, is a German surface physicist who has held the chair of surface and interface physics at the Technical University of Munich since 2006.
Johannes van der Corput
Johannes Gualtherus van der Corput (1890–1975) was a Dutch analytic number theorist whose method of exponential sums transformed number theory, whose 1935 sequence became the prototype for quasi-Monte Carlo methods, and who founded Amsterdam's Mathematisch Centrum.
Johannes van Laar
Johannes Jacobus van Laar (1860–1938) was a Dutch mathematical chemist who, with Bakhuis Roozeboom, founded phase theory and derived the van Laar equation for activity coefficients.
Johannes Walther
Johannes Walther (1860–1937) was a German geologist and paleontologist who formulated Walther's Law of correlation of facies, founded modern sediment research and biogeology, and served as president of the Leopoldina academy from 1924 to 1931.
Johannes Wislicenus
Johannes Adolf Wislicenus (1835–1902) was a German chemist and founder of stereochemistry who first synthesized lactic acid in 1862 and later led the chemical institute at Leipzig.
John A. Cherry
John A. Cherry is a Canadian hydrogeologist who helped found the science of contaminant hydrogeology, co-authored the 1979 textbook Groundwater, and won the 2020 Stockholm Water Prize.