[2] Before joining the public sector, Mancera worked at the Bank of Commerce (nowadays BBVA Bancomer, 1953 – 1955) and taught several courses at the Escuela Libre de Derecho (1956 – 1957).
He was also a member of the faculty of the ITAM (1958 – 1965) and the Latin American Center of Monetary Studies (CEMLA, 1962 – 1964).
[2][1][3] He joined the Mexican central bank (Banxico) in 1957 and 25 years later was appointed general director by President Miguel de la Madrid.
During the 1980s, he faced one of the toughest economic crises in the history of Mexico and in the early 1990s he launched a new national currency, the Mexican Nuevo Peso.
He received the Order of Rio Branco (Brazil, 1983) and he is an officer of the French Légion d'honneur (1990).