Mariano-Florentino Cuéllar

Mariano-Florentino (Tino) Cuéllar is Anthropic’s first Chief Global Affairs Officer, responsible for the company’s policy priorities, global and national security strategies, and government relationships.

Before joining Anthropic, he was President of the Carnegie Endowment for International Peace, and previously, a justice of the Supreme Court of California. He has served in the White House and federal agencies across three presidential administrations, on the President's Intelligence Advisory Board, and on the US Department of State's Foreign Affairs Policy Board. He was a Trustee of Anthropic's Long-Term Benefit Trust from January 2026 until stepping down to join the company.

Cuéllar has also been a longtime member of the Stanford University faculty, with a focus on democracy and public law, artificial intelligence, and international security. Most recently he has served as the Cameron Schrier Family Professor at the Law School and a Senior Fellow at the Institute for Human-Centered Artificial Intelligence. Earlier, he led the Freeman Spogli Institute for International Studies, the Stanford Cyber Initiative, and the Center for International Security and Cooperation. He also chaired the boards of the Center for Advanced Study in the Behavioral Sciences and Stanford Seed.

He co-chaired California's Joint Working Group on Frontier Artificial Intelligence and the bipartisan Task Force on Nuclear Proliferation and American Security, and was a member of the National Academy of Sciences Committee on Social and Ethical Implications of Computing Research.

He is a fellow of the Harvard Corporation and served as chair of the board of the William & Flora Hewlett Foundation. 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 and his wife, Judge Lucy Koh of the U.S. Court of Appeals for the Ninth Circuit, have two children.