From Wikipedia

John George Trump (August 21, 1907 – February 21, 1985) was an American electrical engineer, inventor and physicist. A professor at the Massachusetts Institute of Technology (MIT) from 1936 to 1985, he was a recipient of the National Medal of Science and a member of the National Academy of Engineering.[3][4][5] Trump was noted for developing rotational radiation therapy.[3] Together with Robert J. Van de Graaff, he developed one of the first million-volt X-ray generators.[6] He was the uncle of Donald Trump.[7]