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Greenwood Coal Mine
Greenwood Coal Mine is an anthracite coal strip mine in the Panther Valley of eastern Pennsylvania near Tamaqua, mined since the 1800s and now operated as Lehigh Anthracite.
Greenwood-Tripp asperity model
The Greenwood-Tripp asperity model is a statistical contact-mechanics model published by Greenwood and Tripp in 1970, widely used for asperity load sharing in mixed and boundary lubrication.
Greeves (motorcycles)
Greeves was a British motorcycle manufacturer based in Thundersley, Essex, that built two-stroke motorcycles from 1953 to 1976 and won major motocross and trials championships.
Greg Brockman
Greg Brockman is an American engineer and entrepreneur who co-founded OpenAI with Sam Altman in 2015 and serves as its president, after joining Stripe in 2010 as its first chief technology officer.
Greg Bronevetsky
Greg Bronevetsky (Grigory Bronevetsky) is an American computer scientist at Lawrence Livermore National Laboratory whose research on supercomputer fault tolerance earned a Presidential Early Career Award in 2011.
Gregg T. Beckham
Gregg T. Beckham is an American chemical engineer at the National Renewable Energy Laboratory in Golden, Colorado, known for research converting waste plastics and plant biomass into valuable materials.
Gregory B. Baecher
Gregory B. Baecher is an American civil engineer at the University of Maryland, elected to the National Academy of Engineering in 2006 for probabilistic geotechnical risk methods.
Gregory B. Olson
Gregory B. Olson is an American materials scientist and MIT professor known as a founder of computational materials design, designing alloys on the computer before melting metal.
Gregory C. Rutledge
Gregory C. Rutledge is an American chemical engineer, the Lammot du Pont Professor at MIT, known for electrospun polymer nanofibers and molecular simulation of polymer crystals.
Gregory E. Stillman
Gregory E. Stillman, also known as Gregory Eugene Stillman, was an American electrical engineer and semiconductor researcher at the University of Illinois Urbana-Champaign, elected to the National Academy of Engineering in 1985.
Gregory G. Deierlein
Gregory G. Deierlein is an American structural engineer at Stanford University, director of the Blume Earthquake Engineering Center since 2002, known for performance-based earthquake engineering and design-code influence.
Gregory H. Huff
Gregory H. Huff is an antenna and microwave systems engineer, an Associate Professor of Electrical Engineering at Penn State since 2018 and a 2008 PECASE recipient.
Gregory J. Yurek
Gregory J. Yurek is an American materials scientist who founded American Superconductor in 1987 and was elected to the National Academy of Engineering in 2011.
Gregory Jarvis
Gregory Jarvis, also known as Greg Jarvis, was an American Hughes Aircraft satellite engineer who flew on the Space Shuttle Challenger and died when it broke apart in 1986.
Gregory S. Tseytin
Gregory S. Tseytin (Григорий Цейтин, 1936–2022) was a Russian and American mathematician and computer scientist known for the Tseytin transformation, Tseytin tautologies, and the extension rule in proof complexity.
Gregory S. Vassell
Gregory S. Vassell (1921–2016) was an American power systems engineer who planned American Electric Power's 765-kV transmission network and joined the National Academy of Engineering in 1980.
Gregory V. Lowry
Gregory V. Lowry, also published as Greg Lowry, is an American environmental engineer at Carnegie Mellon University known for research on engineered nanomaterials in water, soil, and plants.
Gregory W. Wornell
Gregory W. Wornell is an American electrical engineer on the MIT faculty since 1991, known for digital watermarking and cooperative wireless diversity, and a Fellow of the IEEE.
Greifswald nuclear power plant
The Greifswald nuclear power plant (Kernkraftwerk Greifswald), also called Lubmin, was an East German plant of Soviet WWER-440 reactors on the Baltic coast, shut down in 1990.
Gremikhinskoye Oil Field
The Gremikhinskoye oil field (Гремихинское месторождение) is an oil field in Udmurtia, Russia, operated by Udmurtneft and known for its high-viscosity oil, discovered in 1964.
Grenade
A grenade, also known as a hand grenade, is a small explosive munition thrown by hand or launched, producing casualties, blast, smoke, or irritant effects at short range.
Grenade launcher
A grenade launcher is a weapon that fires a grenade farther and more accurately than a soldier can throw it, ranging from under-barrel models to automatic grenade machine guns.
Grenergy Renovables
Grenergy Renovables is a Spanish independent power producer, founded in 2007 and headquartered in Madrid, that develops solar and battery storage projects in Europe, Latin America, and the United States.
Grenfell Tower
Grenfell Tower was a 24-storey public housing block in North Kensington, west London, where a fire on 14 June 2017 killed 72 people, spread by combustible cladding fitted during a 2012 to 2016 refurbishment.
Grenzebach
Grenzebach is a German family-owned automation group founded by Rudolf Grenzebach in 1960 in Hamlar, Bavaria, best known for glass and building materials plant engineering and intralogistics systems built on automated guided vehicles.
Grep
Grep is a command-line utility that searches input files for lines matching a regular expression and prints them, written by Ken Thompson at Bell Labs for Unix.
Gresik power station
Gresik power station is a gas-fired power plant in Gresik, East Java, Indonesia, owned by state utility PLN and supplying about 5% of the Java-Bali grid.
Gretel (company)
Gretel (gretel.ai), founded by Alex Watson, Laszlo Bock, John Myers, and Ali Golshan, was a San Diego synthetic data platform company; Nvidia acquired it in March 2025 for a nine-figure sum above its $320 million valuation.
Grey Gardens (estate)
Grey Gardens is a Shingle Style summer house in East Hampton, New York, known as the decaying home of the Beales and the 1975 Maysles documentary.
Grey import vehicle
A gray import vehicle, also called a gray market vehicle, is a vehicle imported outside the manufacturer's official distribution network, usually legally but without official warranty.