Anthropic announced Tuesday that Mariano-Florentino Cuéllar will join the company as its first Chief Global Affairs Officer. In this newly created post, Cuéllar will be responsible for the company’s policy work, international engagement, and relationships with governments around the world.
Cuéllar arrives from the Carnegie Endowment for International Peace, where he most recently served as President of the global policy research institution that maintains scholars across 20 countries. Prior to that role, he was a Justice of the Supreme Court of California, writing opinions that addressed issues including technology, privacy, international agreements, and the separation of powers.
His academic and advisory experience spans multiple positions at Stanford University: he served as director of the Freeman Spogli Institute for International Studies and as co-director of the Center for International Security and Cooperation. He also led the Stanford Cyber Initiative and holds the Cameron Schrier Family Professorship at Stanford Law School, where he began teaching courses on artificial intelligence nearly a decade ago. Cuéllar is additionally a Senior Fellow at Stanford’s Institute for Human-Centered Artificial Intelligence.
On the federal advisory side, Cuéllar has participated on the President’s Intelligence Advisory Board and the U.S. Department of State’s Foreign Affairs Policy Board. His public service record also includes work in the White House and across federal agencies during three presidential administrations.
Outside of university and government roles, Cuéllar has been active in national scientific and security forums. The National Academy of Sciences named him to its Committee on Responsible Computing Research. He co-chaired the bipartisan Task Force on Nuclear Proliferation and American Security and co-led California’s Frontier AI Working Group.
Cuéllar had been serving as a Trustee of Anthropic’s Long-Term Benefit Trust since January 2026. He has stepped down from that trustee role to assume his position at Anthropic. The Trust will select a successor using its standard process.
Statement from Cuéllar
"Policymakers in the US and around the world are increasingly realizing that we are at a critical inflection point when it comes to how we govern and develop artificial intelligence," Cuéllar said.
Reaction from Anthropic
Daniela Amodei said Cuéllar "has spent his career helping public institutions respond to times of change with thoughtfulness, pragmatism, and deep commitment to the common good."
This appointment consolidates a range of Cuéllar’s prior activities—legal adjudication, academic leadership, and federal advising—into a single role focused on global policy and government engagement for an AI company. The move also formalizes his departure from the Trust to avoid overlap between his trustee duties and his new executive responsibilities.
The company has positioned the role to cover policy, international engagement, and government relations worldwide, and Cuéllar’s experience in law, international affairs, and technology policy will inform his work at Anthropic.