Following his release, Taiana held several academic positions until he was appointed Advisor to the Foreign Affairs Committee of the Argentine Chamber of Deputies (1987–89). He was appointed Undersecretary for Organizations and Special Matters after the election of fellow Peronist Carlos Menem in 1989, and in 1990 was appointed Undersecretary for Foreign Policy and later Director of International Organizations (1991). Between 1992 and 1995, he was the Argentine Ambassador to Guatemala and concurrently to Belize. After wide regional support to his candidature, he served as Executive Secretary of the Inter-American Commission on Human Rights of the OAS between 1996 and 2001, and then became Secretary for Human Rights of the Government of the Province of Buenos Aires.