Díez teaches and does research in comparative politics, Latin American politics, social movements, comparative judicial politics, comparative public policy, the politics of sexual and reproductive rights and public opinion formation (as it relates to the use of social media, intra-group social contact, the role of religiosity in the development of democratic values and sexual and reproductive rights).
He is currently working on a SSHRC-funded project on constitutional/supreme courts in Argentina, Colombia, Costa Rica and Mexico. He has been a visiting professor at the University of California-San Diego, Science po - Paris, El Colegio de México, Universidad Diego Portales (Chile) and the Universidad de Costa Rica. He was the 2014-2015 Peggy Rockefeller Visiting Scholar at Harvard University.
In Progress. The Judicial Politics of Abortion in Latin America: Argentina, Colombia, Costa Rica and Mexico. Chappell Hill, NC: North Carolina University Press.
Forthcoming. “The Gay and Lesbian Movements” in Federico M. Rossi (ed.) The Oxford Handbook of Latin American Social Movements. New York, NY: Oxford University Press.
2020 (and Michelle Dion). “Social Contact with Same-Sex Married Couples and Support for Marriage Equality: Evidence from Argentina.” Politics, Groups, and Identities, Vol. 10 No. 2: 313-333.
2020. “The Record of Latin America’s Left on Sexual Citizenship in Manuel Balán and Françoise Montambeault (eds.) Legacies of the Left Turn in Latin America: The Promise of Inclusive Citizenship. South Bend, IN: The University of Notre Dame Press, 252-79.
2019 (and Viviana Bohorquez and Nora Picasso). “La judiciarisation de l’avortement en Amérique Latine et les limites de la citoyenneté” en Problèmes d’Amérique Latine, No. 3: 53-79.
2018 (and Michelle Dion). “Support for Same-Sex Marriage and Social Media in Latin America” in Latin American Research Review Vol. 53 No. 3: 466-84.
2018. “Institutionalizing Same-Sex Marriage in Argentina and Mexico: The Role of Federalism” in Bronwyn Winter (ed.) Global Perspectives in Same-Sex Marriage” A Neo-Institutional Approach. New York: Palgrave- McMillan.
2018. La políttica del matrimonio gay en América Latina: Argentina, Chile y México. México, DF: México: Fondo de Cultura Económica.
2017 (and Michelle Dion). “Democratic Values, Religiosity and Support for Same-Sex Marriage in Latin America” Latin American Politics and Society, Vol 59 No. 4: 75-98.
2015. The Politics of Gay Marriage in Latin America: Argentina, Chile and Mexico. New York: Cambridge University Press.
2013. "Explaining Policy Outcomes: The Adoption of Same-Sex Unions in Buenos Aires and Mexico City” Comparative Political Studies Vol. 46 (February) Vol. 46 No. 2: 1-24.