President Mariano-Florentino Cuéllar

Mariano-Florentino (Tino) Cuéllar is the tenth president of the Carnegie Endowment for International Peace. A former justice of the Supreme Court of California, he served two U.S. presidents at the White House and in federal agencies, and was a faculty member at Stanford University for two decades. 

Before serving on California’s highest court, he was the Stanley Morrison Professor of Law, Professor (by courtesy) of Political Science, and director of the Freeman Spogli Institute for International Studies at Stanford. In this capacity, he oversaw programs on international security, governance and development, global health, cyber policy, migration, and climate change and food security. Previously, he co-directed the Institute’s Center for International Security and Cooperation and led its Honors Program in International Security.

While serving in the Obama White House as the president’s special assistant for justice and regulatory policy, he led the Domestic Policy Council teams responsible for civil and criminal justice reform, public health, immigration, transnational regulatory issues, and supporting the Quadrennial Homeland Security Review. He then co-chaired the U.S. Department of Education’s Equity and Excellence Commission, and was a presidential appointee to the Council of the Administrative Conference of the United States. As a California Supreme Court justice, he oversaw reforms of the California court system’s operations to better meet the needs of millions of limited-English speakers.

A fellow of the American Academy of Arts and Sciences, Cuéllar is the author of Governing Security: The Hidden Origins of American Security Agencies (2013) and has published widely on transnational regulatory and security problems, American institutions, public law, and technology’s impact on law and government. Cuéllar co-authored the first ever report on the use of artificial intelligence across federal agencies. He has served on the National Academy of Sciences Committee on Social and Ethical Implications of Computing Research and the American Academy of Arts and Sciences Commission on Accelerating Climate Action.

He chairs the board of the William & Flora Hewlett Foundation and is a member of the Harvard Corporation. Earlier, he chaired the boards of the Center for Advanced Study in the Behavioral Sciences and Stanford Seed, and co-chaired the Obama Biden Presidential Transition Task Force on Immigration.

Born in Matamoros, Mexico, he grew up primarily in communities along the U.S.-Mexico border. He graduated from Harvard College and Yale Law School, and received a Ph.D. in political science from Stanford University. He began his career at the U.S. Department of the Treasury and the U.S. Court of Appeals for the Ninth Circuit. He servied on ALI's Council from 2014 to 2023.