Mariano-Florentino (Tino) Cuéllar is joining Anthropic as its inaugural Chief Global Affairs Officer, where he will lead the company's policy efforts, strategic international engagement, and government relationships around the world.
Cuéllar's career spans law, technology, international security, and public institutions at the international, national, and state levels. He recently stepped down as President of the Carnegie Endowment for International Peace, a prominent independent global policy research institution with scholars in 20 countries. Before that role, Cuéllar served as a Justice of the Supreme Court of California, where his opinions addressed technology and privacy, international agreements, and the separation of powers, among other topics. He previously directed Stanford's Freeman Spogli Institute for International Studies, co-directed the university's Center for International Security and Cooperation, and led the Stanford Cyber Initiative. He has served on the President's Intelligence Advisory Board and the US Department of State's Foreign Affairs Policy Board, and worked in the White House and federal agencies across three presidential administrations. The National Academy of Sciences appointed him to its Committee on Responsible Computing Research.
In recent years, Cuéllar also co-chaired the bipartisan Task Force on Nuclear Proliferation and American Security, co-led California's Frontier AI Working Group, and served as board chair and later director of the Center for Advanced Study in the Behavioral Sciences. He currently holds the Cameron Schrier Family Professorship at Stanford Law School, where he began his teaching career before joining the judiciary and started organizing classes on artificial intelligence nearly a decade ago. He also serves as Senior Fellow at Stanford's Institute for Human-Centered Artificial Intelligence.
Cuéllar has been a Trustee of Anthropic's Long-Term Benefit Trust since January 2026. He has stepped down from the Trust to take on this new role, and the Trust will select a successor through its standard process.
Cuéllar stated that policymakers in the US and globally are increasingly recognizing a critical inflection point in how AI is governed and developed. He emphasized that the choices made now will determine whether humanity can harness extraordinary possibilities to advance science and improve lives or face enormous risk and growing inequality. He added that democracies must set the terms for this technology's advancement and that there is no more consequential place to shape that work right now than Anthropic.
Daniela Amodei noted that Cuéllar has spent his career helping public institutions respond to times of change with thoughtfulness, pragmatism, and deep commitment to the common good. She highlighted his sound judgment and civic-mindedness across all levels of government, law, and academia, expressing enthusiasm about him bringing these principles to Anthropic. She described him as uniquely prepared to partner with governments, civil society, and community groups as they engage with both the risks and opportunities presented by advanced AI.
Cuéllar arrives at a pivotal moment for Anthropic's engagement with governments worldwide. The questions AI raises for economies, security, and communities absorbing rapid change are being debated by leaders everywhere. Ensuring AI's trajectory is shaped by democratic societies and its benefits reach people broadly remains a critical priority. Cuéllar will help steer this work while finding common cause with heads of state and policy leaders on the questions and possibilities AI is raising for communities around the world.