906 articles
Joachim Barrande
Joachim Barrande (1799–1883) was a French geologist and paleontologist who settled in Prague after the 1830 July Revolution and spent decades describing Bohemia's Early Palaeozoic fossils in his 22-volume Système silurien.
Jochen J. Brocks
Jochen J. Brocks, also published as Jochen Brocks, is a German-trained Australian geobiologist and professor at the Australian National University who studies molecular fossils in Precambrian rocks.
Joel D. Blum
Joel D. Blum is an American geochemist at the University of Michigan known for mercury isotope geochemistry and elected to the National Academy of Sciences in 2020.
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.
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.
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 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.
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.
John Adam Fleming
John Adam Fleming (1877–1956) was an American geophysicist who directed the Carnegie Institution's Department of Terrestrial Magnetism from 1935 to 1946 and led the World Magnetic Survey.
John Arthur Jacobs
John Arthur Jacobs (1916–2003) was a British geophysicist who studied the Earth's core and geomagnetic field, and won the Royal Astronomical Society's Gold Medal in 2002.
John C. Branner
John C. Branner, full name John Casper Branner, was an American geologist of Arkansas and Brazil who became Stanford University's first professor of geology and second president.
John C. Crowell
John C. Crowell (1917–2015) was an American geologist and National Academy of Sciences member who worked out the displacement history of the San Andreas fault system.
John Chapman Frye
John Chapman Frye (1912–1982) was an American geologist, state geologist of Kansas and chief of the Illinois State Geological Survey from 1954 to 1974, elected to the National Academy of Engineering in 1971.
John Chappell
John Michael Arthur Chappell (1940–2018) was a New Zealand-born Australian geoscientist at the Australian National University, called the father of Quaternary research in Australia for his sea-level work.
John D. Bredehoeft
John D. Bredehoeft (1933–2023) was an American groundwater hydrologist who spent 32 years at the U.S. Geological Survey, pioneering digital simulation of groundwater flow and contaminant transport.
John Edward Marr
John Edward Marr (1857–1933) was a British geologist whose graptolite-based fieldwork in the Lake District and Wales shaped Ordovician and Silurian stratigraphy; he was Woodwardian Professor at Cambridge.
John Fillmore Hayford
John Fillmore Hayford (1868–1925) was an American civil engineer and geodesist who established isostasy as a working tool of geodesy and computed the Hayford spheroid, adopted internationally in 1924.
John Flett (Scottish geologist)
John Smith Flett (1869–1947) was a Scottish physician-turned-geologist who directed the Geological Survey of Great Britain from 1920 to 1935 and studied the Old Red Sandstone of Orkney.
John Frederick Dewey
John Frederick Dewey, born 1937 in London, is a British and American structural geologist known for applying plate tectonics to mountain belts, above all the Caledonian and Appalachian systems.
John Graham Ramsay
John Graham Ramsay (1931–2021) was a British structural geologist, a Fellow of the Royal Society, who held professorships at Imperial College, Leeds, and ETH Zurich and wrote the influential Folding and Fracturing of Rocks (1967).
John Henry Alexander
John Henry Alexander (1812–1867) was an American scientist and civil engineer from Annapolis, Maryland, who directed Maryland's first topographical and geological survey from the 1830s.
John Horne
John Horne (1848–1928) was a Scottish geologist who, with collaborator Ben Peach, resolved the NW Highlands controversy by proving the Moine thrust, and rose to Assistant Director of the Geological Survey of Scotland.
John M. Eiler
John M. Eiler is an isotope geochemist at Caltech, known for pioneering clumped isotope thermometry and elected to the National Academy of Sciences in 2016.
John M. Zachara
John M. Zachara was an American environmental geochemist who spent his career, 1979 to 2016, at Pacific Northwest National Laboratory, studying metals, radionuclides, and contaminants at Hanford.
John Mason Clarke
John Mason Clarke (1857–1925) was an American paleontologist and geologist who directed the New York State survey and museum and became a leading authority on the Devonian system.
John Milne
John Milne (1850–1913) was a British geologist and mining engineer who became a founder of modern seismology in Tokyo, developing the standard horizontal pendulum seismograph.
John Peter Lesley
John Peter Lesley (1819–1903) was an American geologist, a founding member of the National Academy of Sciences, and director of the Second Geological Survey of Pennsylvania.
John R. L. Allen
John R. L. Allen, also known as John Robert Lawrence Allen, was a British geologist who helped found quantitative, process-based sedimentology and spent his career at the University of Reading.
John Reager
John (J.T.) Reager is an American remote-sensing hydrologist at NASA's Jet Propulsion Laboratory who leads its Water and Ecosystems Group and won a 2019 Presidential Early Career Award.
John Reynolds (cosmochemist)
John Reynolds was an American cosmochemist and geophysicist at the University of California, Berkeley, remembered as the father of extinct radioactivities for his 1960 discovery of xenon-129 in meteorites.