 His other academic activities have seen him work at the Centro de Investigación y Docencia Económicas (CIDE) and the UNAM.From 16 March to 30 November 1982, he served as Ambassador to the United States of America and from 1989 to 1993, as Ambassador to the United Kingdom.Between those two diplomatic postings from December 1982 to 1988, he served as Secretary of Foreign Affairs under President Miguel de la Madrid.