Manuel Sandoval Vallarta (1899-1977). Born in Mexico
City. He studied at the Massachusetts Institute of Technology
(MIT), where he received his degree in science and specialised in
theoretical physics (1924). With a scholarship from the Guggenheim
Foundation (1927-1928), he studied physics in Berlin and Leipzig.
From 1923 to 1946, he worked as an assistant, associate, and
regular professor at the MIT, and guest professor at the Lovaina
University in Belgium (Cooperation with Lemaître). From 1943, he
divided his time between MIT and the School of Sciences and the
Institute of Physics of the National Autonomous University of
Mexico (UNAM). His main contributions were in mathematic methods,
quantum mechanics, general relativity and, from 1932, cosmic
rays.