42,772 articles
Harold Grad
Harold Grad (1923–) is an American applied mathematician at New York University's Courant Institute, known for the Boltzmann–Grad limit, rarefied gas kinetic theory, and magnetohydrodynamic plasma theory.
Harold Hibbert
Harold Hibbert (1877–1945) was an English-born chemist, E. B. Eddy Professor at McGill from 1925 to 1943, whose ethanolysis work yielded the Hibbert Bausteine, lignin building units still named for him.
Harold Hopkins (physicist)
Harold Horace Hopkins (1918–1994) was a British physicist and professor of applied optics at Reading whose fibrescope, announced in 1954, and rod-lens endoscope transformed minimally invasive surgery.
Harold Hotelling
Harold Hotelling (1895–1973) was an American mathematical statistician and economic theorist at Stanford, Columbia, and North Carolina, known for Hotelling's T-squared test, principal component analysis, and the Hotelling rule.
Harold J. Kushner
Harold J. Kushner is an American control theorist and applied mathematician at Brown University who developed nonlinear filtering, the Kushner–Stratonovich equation, and numerical methods for stochastic control.
Harold Jeffreys
Sir Harold Jeffreys (1891–1989) was a British geophysicist and Bayesian statistician at Cambridge who demonstrated the Earth's liquid core and wrote Theory of Probability (1939).
Harold Johnson (astronomer)
Harold Lester Johnson (1921–1980) was an American observational astronomer who introduced the UBV photometric system with W. W. Morgan, the international standard for measuring stellar brightness, and extended it into the infrared.
Harold K. Forsen
Harold K. Forsen (1932–2012) was an American plasma physicist who worked on fusion at General Atomics, built the University of Wisconsin–Madison's fusion program, and later served as an executive at Exxon Nuclear and Bechtel.
Harold Lloyd James
Harold Lloyd James was an American economic geologist whose 1954 facies model reshaped the study of iron-formation, and who served as chief geologist of the U.S. Geological Survey.
Harold Neville Vazeille Temperley
Harold Neville Vazeille Temperley was a British statistical physicist who solved the close-packed dimer problem with Michael Fisher in 1961 and gave his name to the Temperley–Lieb algebra.
Harold P. Eubank
Harold Porter Eubank was an American physicist who spent 1959 to 1985 at the Princeton Plasma Physics Laboratory, heading neutral beam research for magnetic fusion experiments.
Harold S. Johnston
Harold S. Johnston (1920–2012) was an American chemist at UC Berkeley whose 1971 calculation that nitrogen oxides in supersonic aircraft exhaust could destroy stratospheric ozone earned him the 1997 National Medal of Science.
Harold S. Shapiro
Harold S. Shapiro, also known as Harold Seymour Shapiro, was an American-born Swedish mathematician, professor at KTH Stockholm, known for the Golay–Rudin–Shapiro polynomials and the Shapiro cyclic inequality.
Harold Scott MacDonald Coxeter
Harold Scott MacDonald Coxeter (1907–2003) was a Canadian mathematician and classical geometer who spent 67 years at the University of Toronto and classified reflection groups.
Harold Spencer Jones
Harold Spencer Jones (1890–1960) was an English astronomer who served as Astronomer Royal from 1933 to 1955 and determined the solar parallax from observations of Eros.
Harold Stark
Harold Stark (born 1939) is an American number theorist who solved the Gauss class number 1 problem in 1967 and formulated the Stark conjectures on L-function values.
Harold W. Kuhn
Harold W. Kuhn (1925–2014) was an American Princeton mathematician known for the Karush–Kuhn–Tucker conditions, the Hungarian algorithm, and championing John Nash's 1994 Nobel Prize; he won the 1980 von Neumann Theory Prize.
Harold Widom
Harold Widom (1932–2021) was an American mathematician at UC Santa Cruz who made foundational contributions to Toeplitz operators and, with Craig Tracy, discovered the Tracy–Widom distributions.
Harold Y. Hwang
Harold Y. Hwang (황윤성) is an American condensed matter physicist, professor at Stanford and SLAC, known for superconductivity in infinite-layer nickelates and emergent phenomena at oxide interfaces.
Harold Y. McSween
Harold Y. McSween, known as Hap McSween, is an American planetary petrologist and cosmochemist at the University of Tennessee, Knoxville, who proposed that the shergottite meteorites came from Mars.
Harrie Massey
Harrie Massey, full name Harrie Stewart Wilson Massey, was an Australian-born mathematical physicist who built atomic collision theory in Britain and led its early space program.
Harris hawks optimization
Harris hawks optimization (HHO) is a population-based, gradient-free metaheuristic for continuous global optimization, introduced in 2019 and inspired by the cooperative hunting of Harris's hawks.
Harrison Brown
Harrison Brown (1917–1986) was an American geochemist who developed the plutonium isolation process for the Manhattan Project, then used meteorites to date the Earth at 4.5 billion years.
Harrison Gray (research geologist)
Harrison J. Gray is an American research geologist at the USGS Geosciences and Environmental Change Science Center in Lakewood, Colorado, who received the 2025 PECASE award.
Harrison Schmitt
Harrison Hagan "Jack" Schmitt is an American geologist, astronaut, and senator who flew on Apollo 17 in 1972 as the twelfth and last person to walk on the Moon.
Harrison Shull
Harrison Shull (1923–2003) was an American theoretical chemist known for quantum-mechanical work on small-molecule electronic spectra and elected to the National Academy of Sciences in 1969.
Harry A. Atwater
Harry A. Atwater is an American applied physicist and electrical engineer at Caltech who gave plasmonics its name in 2001 and directs research on solar fuels and photovoltaics.
Harry Albert Atwater Jr.
Harry Albert Atwater Jr., also known as Harry A. Atwater Jr., is an American applied physicist at Caltech known for plasmonics, metasurfaces, and solar energy research.
Harry B. Gray
Harry B. Gray, born in 1935, is an American inorganic chemist at Caltech known for demonstrating long-range electron tunneling through proteins and for solar fuels research.
Harry B. Whittington
Harry B. Whittington, also known as Harry Blackmore Whittington, was a British paleontologist (1916–2010), professor at Harvard and Cambridge, and leading trilobite authority who re-described the Burgess Shale.