After taking non-tenure-track positions at North Carolina State College, Brown University, and NASA's Langley Research Center, Gelbart took a faculty position at Syracuse University in 1943.
A NASA team led by Langley Research Center with contributions from other NASA Centers, government organizations, academia, and NASA HQ successfully developed a feasible mission concept that achieved all science objectives.
From 1964 to 1970 he was with the National Aeronautics and Space Administration (NASA) Langley Research Center in Hampton, Virginia and from 1970 to 1983 he was with the Department of Electrical Engineering, West Virginia University, Morgantown, WV.
Other wind tunnel studies of deflected slipstream VTOL mechanics were conducted in 1955 and 1956 by Richard Kuhn and John Draper at the NACA Langley Research Center.
As Chief Scientist at NASA Langley Research Center, he is responsible for technical oversight and advanced program formulation.
His most prominent positions during his career were Director of NASA's Langley Research Center, and Chairman of the Apollo 13 Review Board which investigated the explosion that occurred during the Apollo 13 spaceflight in 1970.
One side of the live room wall is covered with custom made foil encrusted foam sound dampeners designed and shipped by an engineer from NASA Langley Research Center, Hampton, VA.
In 2003, LGarde, together with partners JPL, Ball Aerospace, and Langley Research Center, under the direction of NASA, developed a solar sail configuration that utilized inflatable rigidized boom components to achieve 10,000 m2 sailcraft with a real density of 14.1 g/m2 and potential acceleration of 0.58 mm/s2.
During this time, he conducted research on carbon nanotechnology at the NASA Langley Research Center.
Because news of the publication spread via the World Wide Web, requests for the copies of the book came in from organizations and nations around the world—including requests from the National Army of Pakistan, the Canadian government, a leading luxury hotel chain based in Indonesia, NASA's Langley Research Center, and an EPA regional office, which asked to be supplied with books anonymously for fear of reprisals from the Bush Administration.
A series of scramjet ground test were completed at NASA Langley Arc-Heated Scramjet Test Facility (AHSTF) at simulated Mach 8 flight conditions.
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In July 1966 the Gemini Program joined in a NASA Langley Research Center contract to include an evaluation of Gemini EVA tasks.
The Laboratory also has ties with the M.I.T. Lincoln Laboratory, NASA Langley, the Jet Propulsion Laboratory and the Air Force Research Laboratory, as well as the Departments of Electrical and Mechanical Engineering at M.I.T., and aerospace companies such as Draper, TRW, Lockheed-Martin, MDA and Hughes.