Adolfo López Mateos (Spanish pronunciation: [aˈðolfo ˈlopez maˈteos]; 26 May 1909 – 22 September 1969) was a Mexican politician who served as President of Mexico from 1958 to 1964. Beginning his political career as a campaign aide of José Vasconcelos during his run for president, López Mateos encountered repression from Plutarco Elías Calles, who attempted to maintain hegemony within the National Revolutionary Party (PNR). He briefly abandoned politics and worked as a professor at the Autonomous University of Mexico State, becoming a member of the PNR (renamed Party of the Mexican Revolution) in 1941. López Mateos served as senator for the State of Mexico from 1946 to 1952 and Secretary of Labor during the administration of Adolfo Ruiz Cortines from 1952 to 1957. He secured the party's