Technology and the built world

J. David Hellums

J. David Hellums, also known as Jesse David Hellums (1929–2016), was an American chemical engineer at Rice University who pioneered bioengineering and studied how shear stress activates blood platelets.

J. Donovan Jacobs

J. Donovan Jacobs, Joseph Donovan Jacobs (1908–2000), was an American civil engineer elected to the National Academy of Engineering in 1969 for inventing the tunnel sliding floor for rapid excavation.

J. Erik Jonsson

J. Erik Jonsson, born John Erik Jonsson, was an American engineer and industrialist who co-founded Texas Instruments and served as mayor of Dallas from 1964 to 1971.

J. Fred Bucy

J. Fred Bucy is an American physicist and semiconductor executive who spent 1953 to 1985 at Texas Instruments, rising to president in 1976 and CEO in 1984.

J. George Thon

J. George Thon (c. 1908–1988) was a Polish-born civil engineer who designed major hydroelectric, nuclear, and transit systems and joined the National Academy of Engineering in 1975.

J. Halcombe Laning

J. Halcombe Laning, Jr. (1920–2012) was an American computer pioneer and aerospace engineer at MIT known for the George compiler, Q-guidance, and Apollo's onboard software.

J. Herbert Waite

J. Herbert Waite is an American biochemist and materials scientist at UC Santa Barbara who identified the DOPA-rich proteins that let mussels glue themselves underwater.

J. Jim Hsieh (谢吉姆)

J. Jim Hsieh (谢吉姆) is an American semiconductor laser engineer and entrepreneur, founder of Sheaumann Laser, elected to the National Academy of Engineering in 2015 for long-wavelength fiber-optic lasers.

J. K. Spruce Station

J. K. Spruce Station is a two-unit coal-fired power plant on Calaveras Lake near San Antonio, Texas, owned by CPS Energy and scheduled to end coal combustion by 2028.

J. Karl Hedrick

J. Karl Hedrick (John Karl Hedrick, 1944–2017) was an American control engineer, professor of mechanical engineering at UC Berkeley, known for nonlinear control theory applied to transportation.

J. Keith Brimacombe

J. Keith Brimacombe (1943–1997) was a Canadian metallurgical engineer at the University of British Columbia who pioneered coupling mathematical modeling with plant measurements in metal casting.

J. Lewis Blackburn

J. Lewis Blackburn (1913–1997) was an American electrical engineer who spent his career at Westinghouse, led the IEEE Power System Relaying Committee, and wrote the standard protective relaying textbooks.

J. Nicholas Laneman

J. Nicholas (Nick) Laneman is an American electrical engineer at the University of Notre Dame known for cooperative wireless communication research and a 2006 PECASE award.

J. R. D. Tata

J. R. D. Tata (Jehangir Ratanji Dadabhoy Tata) was a French-born Indian aviator and industrialist who flew India's first flight in 1932 and chaired the Tata group from 1938 to 1991.

J. Randolph Paulling

J. Randolph Paulling was a professor of naval architecture at the University of California, Berkeley, whose 1959 analysis of unstable ship motions founded the study of parametric rolling.

J. Th. M. De Hosson

J. Th. M. De Hosson, full name Jeff Th. M. De Hosson, is a Dutch materials scientist who was professor of applied physics at the University of Groningen.

J.A.R.V.I.S.

J.A.R.V.I.S., short for Just A Rather Very Intelligent System, is the fictional AI assistant Tony Stark created in the Marvel Cinematic Universe, voiced by Paul Bettany.

J.M. White

The J.M. White was a sidewheel cotton packet steamboat built in 1878 at Jeffersonville, Indiana, running the lower Mississippi until she burned at a Louisiana landing in 1886.

J.T. Deely Station

The J.T. Deely Station was an 871-MW, two-unit coal-fired power plant on Calaveras Lake near San Antonio, Texas, operated by CPS Energy from 1977 until its 2018 closure.

J2 perturbation

The J2 perturbation is the largest non-spherical gravitational effect on a satellite orbit, caused by Earth's equatorial bulge, which steadily regresses the node and rotates perigee.

Jabil

Jabil Inc. is an American engineering, manufacturing, and supply chain solutions company headquartered in St. Petersburg, Florida. Founded in 1966, it builds products for companies in healthcare, automotive, and AI data center infrastructure.

Jabiluka

Jabiluka is an undeveloped uranium deposit in the Northern Territory of Australia, entirely surrounded by Kakadu National Park; its mineral lease was refused renewal in 2024.

Jabodebek LRT

Jabodebek LRT, or LRT Jabodebek, is a driverless light rail system connecting Jakarta with Depok and Bekasi in Indonesia, opened in 2023 and operated by Kereta Api Indonesia.

Jacana Oil Field

The Jacana oil field is an onshore field in the Llanos 34 Block in Casanare, Colombia, discovered in 2015 and operated by GeoPark with Parex Resources.

Jack A. Morton

Jack A Morton was an American electrical engineer and Bell Labs vice president who led the mass-production of the transistor, earning the IEEE David Sarnoff Medal in 1965.

Jack Clark

Jack Clark is an American technology executive and writer who co-founded Anthropic in 2021, led its policy work, and writes the weekly AI newsletter Import AI.

Jack County power station

The Jack County power station, formally the Jack County Generation Facility, is a natural gas-fired plant near Jacksboro, Texas, with two combined cycle blocks totaling about 1,280 MW.

Jack Dennis

Jack Bonnell Dennis (1931–2026) was an MIT computer science professor known for the Multics operating system and pioneering dataflow models of computation, winning the Eckert-Mauchly Award.

Jack Dongarra

Jack Dongarra, born in 1950, is an American computer scientist whose numerical libraries and the TOP500 supercomputer benchmark shaped high-performance computing, earning him the 2021 Turing Award.