John George Trump (August 21, 1907 – February 21, 1985) was an American electrical engineer and professor at the Massachusetts Institute of Technology (MIT). He pioneered the use of high-voltage generators in cancer treatment and was founding chairman of High Voltage Engineering Corporation, a leading manufacturer of particle accelerators.
Trump received his electrical engineering doctorate as the first student of MIT physicist Robert J. Van de Graaff. He joined MIT's faculty in 1935 and designed compact, high-voltage Van de Graaff generators for use in cancer radiotherapy. Trump later directed MIT's High Voltage Research Laboratory, which developed new radiotherapy techniques, trained radiologists, and treated more than 10,000 patients. Under Trump, the lab explored the generation and use of electrostatic power in medical sterilization, spacecraft propulsion, wastewater disinfection, and direct current power transmission.
Ahead of American entry into World War II, Trump joined the National Defense Research Committee (NDRC), the government's main effort to organize civilian scientists for war. As technical aide to Karl Compton, he helped establish the Radiation Laboratory to develop microwave radar. He served on the lab's steering committee and as an NDRC divisional secretary, managing the NDRC's portfolio of radar contracts. In February 1944, he went to England to direct the Rad Lab's field operation in Europe. There, he organized radar deployments for the D-Day invasion, aided interception of V-1 missiles, and advised American commanders on radar use in combat. He received service commendations from President Truman and King George VI.
In 1946, Trump organized the High Voltage Engineering Corporation (HVEC) with Van de Graaff and Denis Robinson to build compact Van de Graaff accelerators for cancer therapy. They received one of the first three investments of the American Research & Development Corporation, the first modern venture capital firm. As chairman, Trump oversaw the company's growth and debut on the New York Stock Exchange. HVEC became the largest global supplier of research particle accelerators as government funding for nuclear science expanded, and later diversified into industrial products.
Trump retired from the MIT faculty in 1973 and remained active as a trustee of Boston's Museum of Science and board chairman of the Lahey Clinic, a regional hospital. President Reagan awarded Trump the National Medal of Science in 1983 for the "beneficial application of ionizing radiation to medicine, industry and atomic physics." Trump was the paternal uncle of Donald Trump, the 45th and 47th president of the United States.
Early life and education New York years (1907–1931) Born in the Bronx, New York City, on August 21, 1907, John Trump was the youngest of three children born to German immigrants Frederick and Elizabeth Christ Trump. After the Queensboro Bridge opened in 1909, the family moved to Queens, eventually settling in the Woodhaven neighborhood. When Trump was 11, his father died in the 1918 influenza pandemic, leaving his mother to support the family.
Like his siblings, Trump attended Richmond Hill High School, where he was a gifted student. He joined Western Electric's Manhattan engineering office in 1923, two years before it became known as Bell Labs.
Both John Trump and his older brother Fred joined their family's real estate firm. Their mother hoped that Fred would build homes and John design them. With support from his brother, John enrolled at Brooklyn Polytechnic Institute to study architecture. The brothers' work together ended due to differences in business philosophy: Fred preferred to sell units as they were planned; John thought they should only sell once constructed. By the end of his freshman year, John left the family real estate business and switched his concentration from architecture to engineering.
Selected as Brooklyn Poly's valedictorian, Trump graduated from in 1929 with a bachelor's degree in electrical engineering. While teaching electrical engineering at his alma mater, he earned his master's degree in physics from Columbia University in 1931.
MIT doctorate (1931–1933)
In fall 1931, Trump arrived at the Massachusetts Institute of Technology (MIT) to pursue a PhD in electrical engineering. MIT's new president, the physicist Karl Compton, was recruiting scientists to strengthen basic research at the institute. Vannevar Bush, dean of MIT's engineering school, recommended Trump work with one of these recruits: Robert J. Van de Graaff, a 29-year-old physicist developing a new electrostatic generator. Van de Graaff became Trump's advisor and lifelong collaborator.
Van de Graaff sought to build a generator with sufficiently strong electric potential to artificially split the atom. He split his research between open-air models, which required large terminals, and vacuum-insulated designs, which were compact but technically challenging. In 1933, Van de Graaff demonstrated the Round Hill generator, a air-insulated generator that produced dramatic electrical arcs and attracted broad press coverage. But the demonstration also revealed the design's fundamental limitation: high voltages broke down in open air.
To overcome these limits, Trump worked on vacuum techniques. He designed a synchronous alternating-current motor to power a vacuum, which proved highly efficient. Encouraged by this practical innovation, his dissertation also proposed a method to build vacuum-insulated, long-distance transmission lines for high-voltage direct current. In 1932, Van de Graaff filed to patent components in the transmission system. The new Tennessee Valley Authority showed interest in developing these patents for its hydropower projects, and Vannevar Bush offered to license them to the TVA by assigning them to the Research Corporation. Though the transmission project fell through, MIT became the first private university with a policy of research commercialization, and its arrangement was an influential predecessor to university patent licensing.
Trump received his doctorate of electrical engineering in 1933. His thesis, Vacuum Electrostatic Engineering, described these contributions and examined the factors governing voltage-insulation strength in vacuums.
Early career After graduating, Trump remained at MIT as a research associate, then became an assistant professor in 1936. His research focused on improving high-voltage generators and finding new uses for them in industry.
While writing his thesis, Trump had learned about an MIT lecture on medical uses of high-voltage x-rays. At the time, low-voltage radiotherapy techniques could only target superficial tissues and required long exposures that damaged skin. Because Van de Graaff sources produced steady, controllable, power that other high-voltage sources could not, Trump hypothesized that they could produce penetrating, precise x-rays that could target deeper tumors.
In May 1935, Trump showed that striking a gold target with the Van de Graaff electron beam produced abundant x-rays. The Godfrey M. Hyams Trust funded the construction of a 1-MV generator for Harvard's Huntington Memorial Hospital, which entered service in March 1937. The first of several hospital generators Trump would build, it required a room-sized voltage terminal with an internal focusing coil suspended over the patient in the room below. Though just one-third the height of the Round Hill generator, its operators saw it as "magnificent monster." Radiologists reported that it provided "increased depth dosages, greater skin sparing, and greater intensity" than radium exposure, then the prevailing technique. The first patient treated by the Huntington machine survived beyond four years. However, Huntington Hospital survived only another four years, and the machine was shut down in 1941.
Trump focused his research on making hospital generators smaller and more controllable. He adopted a pressurized gas (SF6) system developed by Raymond Herb, which allowed him to increase dielectric strength at a smaller size. He built a compact 1.25-MV generator for Massachusetts General Hospital in 1940, which treated patients for sixteen years. He built another generator for the Philadelphia Oncologic Hospital. Trump's pre-war generator installations have been acknowledged as precursors to the field of radiosurgery.
Trump's gas-insulated generator would find other commercial applications. With World War II engulfing Europe and Asia, the United States began expanding its military fleet production. With engineers at Boston Navy Yard, Trump discovered that his high-voltage x-ray generator could detect manufacturing defects in ships and aircraft. Robert Van de Graaff carried this work forward through MIT's High Voltage Radiographic Project, supplying generators for Navy efforts to inspect ship hulls and captured enemy munitions.
World War II service Radiation Laboratory administration
During World War II, Trump interrupted his research on x-ray therapy to work on military uses of microwave radar. In June 1940, Vannevar Bush organized the National Defense Research Committee (NDRC) to direct the White House's wartime research strategy. Trump joined the NDRC as technical aide to MIT president Karl Compton, who chaired the committee's radar and detection section (Division D).
In October 1940, British scientists demonstrated secret microwave transmitters to the United States, offering radar dramatic improvements in resolution and range. NDRC members pressed Compton to organize a research effort at MIT. On October 24, Trump attended the preliminary planning conference in Compton's office alongside Alfred Loomis, Lee DuBridge, and NDRC secretary Edward L. Bowles. The group identified laboratory space, and within a week submitted a funding proposal to the NDRC. On November 11, the newly christened Radiation Laboratory held its first personnel meeting. By mid-December, about 30 physicists had begun work in hastily converted space in MIT Room 4-133.
The Rad Lab's first year focused on conceptual radar research. As Compton's NDRC aide, Trump oversaw the NDRC's contract with MIT, the first and largest university contract of the war. The attack on Pearl Harbor pushed the lab into radar equipment production, and its rapid expansion pulled Trump deeper into its business operations. In March 1942, the lab adopted a new divisional organization, and director Lee DuBridge appointed Trump to its Steering Committee, the body that set research priorities and approved projects. The next month, Trump succeeded Bowles as secretary of the Microwave Committee, the NDRC body supervising all government radar research contracts.
Trump combined his oversight role with his existing responsibilities as NDRC representative at the Rad Lab. By 1942, Trump's NDRC office had grown to five staff members and five secretaries, and became "a very important administrative unit in the radar program." In December 1942, the Microwave Committee became Division 14 (Radar) under an NDRC reorganization. From an office in the Rad Lab, Trump's supervised the lab's contract and policy while giving its scientific leadership wide operational freedom. The radar program spent $1.5 billion across university and industrial contracts, becoming the NDRC's largest program and comparable in scale to the $2 billion Manhattan Project.
During Trump's tenure in the Rad Lab's administration, it grew into the war's largest civilian research contractor. At its peak, the lab employed 3,879 personnel, constructed three buildings on the MIT campus, opened field operations around the world, and fulfilled $110,758,000 in government research contracts—roughly 80 percent of the United States' radar research budget. The lab introduced capabilities including early warning systems, gun-laying fire control, and bombing through cloud cover, giving American forces a growing technological advantage.