Che Guevara: The Revolutionary App. Who is Che Guevara? Born in Rosario, Argentina, in 1928, Ernesto "Che" Guevara de la Serna studied medicine before traveling around South America, observing conditions that spurred his Marxist beliefs. He aided Fidel Castro in overturning the Batista government in the late 1950s, and then held key political offices during Castro's regime.