20th-century American engineers

Stephen Gary Wozniak (; born August 11, 1950), also known by his nickname "Woz", is an American electrical engineer, computer programmer, philanthropist, and inventor. In 1976, he co-founded Apple Computer with his early business partner Steve Jobs. Through his work at Apple in the 1970s and 1980s, he is widely recognized as one of the most prominent pioneers of the personal computer revolution.In 1975, Wozniak started developing the Apple I: 150  into the computer that launched Apple when he and Jobs first began marketing it the following year. He primarily designed the Apple II, introduced in 1977, known as one of the first highly successful mass-produced microcomputers, while Jobs oversaw the development of its foam-molded plastic case and early Apple employee Rod Holt developed its switching power supply. With human–computer interface expert Jef Raskin, Wozniak had a major influence over the initial development of the original Apple Macintosh concepts from 1979 to 1981, when Jobs took over the project following Wozniak's brief departure from the company due to a traumatic airplane accident. After permanently leaving Apple in 1985, Wozniak founded CL 9 and created the first programmable universal remote, released in 1987. He then pursued several other businesses and philanthropic ventures throughout his career, focusing largely on technology in K–12 schools.As of February 2020, Wozniak has remained an employee of Apple in a ceremonial capacity since stepping down in 1985. In recent years, he has helped fund multiple entrepreneurial efforts dealing in areas such as GPS and telecommunications, flash memory, technology and pop culture conventions, technical education, ecology, satellites and more.

Ronald Ellwin Evans Jr. (November 10, 1933 – April 7, 1990) was an American electrical engineer, aeronautical engineer, officer and aviator in the United States Navy, and NASA astronaut. As Command Module Pilot on Apollo 17 he was one of the 24 astronauts to fly to the Moon, and one of 12 people to fly to the Moon without landing.
Before becoming an astronaut, Evans graduated with a Bachelor of Science degree in electrical engineering from the University of Kansas and joined the U.S. Navy in 1956. After receiving his naval aviator wings, he served as a fighter pilot and flew combat missions during the Vietnam War. In 1964 he received a Master of Science degree in aeronautical engineering from the U.S. Naval Postgraduate School. Achieving the rank of captain, he retired from the Navy in 1976.
Evans was selected as an astronaut by NASA as part of NASA Astronaut Group 5 in 1966 and made his only spaceflight as command Module pilot aboard Apollo 17 in December 1972, the last crewed mission to the Moon, with Commander Gene Cernan and Lunar Module Pilot Harrison Schmitt. During the flight, Evans and five mice orbited the Moon a record 75 times as his two crewmates descended to and explored the surface. He is the last person to orbit the Moon alone and, at 147 hours and 43 minutes, holds the record for the most time spent in lunar orbit. During Apollo 17's return flight to Earth, Evans performed an extravehicular activity (EVA) to retrieve film cassettes from the service module. It was the third "deep space" EVA, and is the spacewalk performed at the greatest distance from any planetary body. As of 2024, it remains one of only three deep space EVAs, all made during the Apollo program's J-missions. It was the final spacewalk of the Apollo program.
In 1975, Evans served as backup Command Module Pilot for the Apollo–Soyuz Test Project mission. He worked on the development of the Space Shuttle before retiring from NASA in March 1977 to become a coal industry executive.

Charles William Duncan Jr. (September 9, 1926 – October 18, 2022) was an American businessman, administrator, and politician best known for serving as U.S. Secretary of Energy in the Cabinet of President Jimmy Carter from 1979 to 1981. He had previously served as Carter's United States Deputy Secretary of Defense during the Iranian Revolution. Earlier, Duncan had run the family business, Duncan Coffee Company of Houston, Texas, for seven years, until the Coca-Cola Company acquired it in 1964. After seven years on the Coke board, Duncan became the corporation's president.

Robert Rowe Gilruth (October 8, 1913 – August 17, 2000) was an American aerospace engineer and an aviation/space pioneer who was the first director of NASA's Manned Spacecraft Center, later renamed the Lyndon B. Johnson Space Center.He worked for the National Advisory Committee for Aeronautics (NACA) from 1937 to 1958 and its successor NASA, until his retirement in 1973. He was involved with early research into supersonic flight and rocket-powered aircraft, and then with the United States human spaceflight program, including the Mercury, Gemini, and Apollo programs.

James Benson "Jim" Irwin (March 17, 1930 – August 8, 1991) was an American astronaut, aeronautical engineer, test pilot, and a United States Air Force pilot. He served as Lunar Module pilot for Apollo 15, the fourth human lunar landing. He was the 8th person to walk on the Moon and the first, and youngest, of those astronauts to die.

Charles Stowe Myers FIDSA (December 7, 1906 – August 6, 1995) was an American industrial designer.

James L. Buie (1920 – September 25, 1988) was an American scientist and inventor working for TRW Inc who developed transistor–transistor logic, a form of integrated circuit technology that became widely used early in the integrated circuit industry.

Milton Spinoza Plesset (7 February 1908 – 19 February 1991) was an American applied physicist who worked in the field of fluid mechanics and nuclear energy. He was elected to the National Academy of Engineering in 1979 for his fundamental contributions to multiphase flows, bubble dynamics, and safety of nuclear reactors. Plesset served as professor of engineering science at California Institute of Technology during 1951 to 1978. Notable scientists Andrea Prosperetti, Norman Zabusky, and Chris Whipple finished their doctoral work under Plesset's guidance. Milton Plesset, Andrea Prosperetti, and Chris Whipple were elected to the National Academy of Engineering.
He with Christian Møller are known for the Møller–Plesset perturbation theory.
The Rayleigh-Plesset equation describing the dynamics of a bubble in an infinite body of fluid is also named after him.

James Donahue Burke (September 18, 1925 – August 19, 2023) was an American lunar settlement and exploration expert. He was known for being the first manager of the Ranger program, and considered one of the pioneers of America's space program.

George Harold Brown (14 October 1908 – 11 December 1987) was an American research engineer. He was a prolific inventor who held more than 80 patents and wrote over 100 technical papers.
He led the RCA Corporation's efforts to develop a color television system which is still in use today. He was associated with the RCA for over forty years, becoming an executive vice president for research and engineering in November 1961.