sentences:  President Adolfo Ruiz Cortines appointed him director-general of the Mexican Institute of Social Security (IMSS) serving from 1952 to 1958.From 1958 to 1970 he served as Secretary of Finance and Public Credit for a twelve-year period of sustained economic growth and development under presidents Adolfo López Mateos and Gustavo Díaz Ordaz.At least in two occasions, in 1963 and 1969, he was considered a strong contender to the presidency representing the then-hegemonic Institutional Revolutionary Party (PRI), and even former President Miguel Alemán was among his supporters.