Ambassador Ruiz Cabañas was born on January 12, 1957 in Mexico City. He holds a B.A. in International Relations from the Colegio de México (1974-1978) and a Master's degree in Political Science from Columbia University in New York (1986-1988).

He has been a career diplomat since entering the Mexican Foreign Service in January 1979. He was appointed Ambassador on June 30, 1998.

He served as head of Drug Trafficking Affairs and head of Social and Humanitarian Affairs (1981-1986) in the Permanent Mission of Mexico to the United Nations, and was the officer in charge of migratory and border issues at the Embassy of Mexico in the United States (1993-1995).

From 2001 to 2004, he was Mexico's Permanent Representative to the Organization of American States (OAS), and subsequently Ambassador of Mexico to Japan. In 2011, he was appointed Ambassador to Italy and Permanent Representative of Mexico to the International Organizations based in Rome.

In the Foreign Ministry, he has been Director for the United Nations System (1989-1991); Chief Advisor to the Undersecretary for Europe, Asia and Africa (1991-1992); and Chief Advisor to the Undersecretary for America (1992-1993). He has also been the Special Coordinator for Drug Trafficking Affairs (1995-1999); and Director General for North America (1999-2001).

On September 16, 2015, he was appointed Undersecretary for Multilateral Affairs and Human Rights of the Foreign Ministry.

He has been professor of International Relations and Foreign Policy at several Mexican universities, including the Iberoamericana University, the University of the Americas, the National Defense College and the Instituto Tecnológico Autónomo de México (ITAM).

He has lectured at various universities in Argentina, Spain, the United States and Japan, and has written articles for research center and university publications in Mexico and the United States on the Mexico-United States relationship, Mexico's participation in the Organization of American States and the United Nations, and drug trafficking and security in the Americas.