Mariano-Florentino "Tino" Cuéllar is an American scholar, academic leader, public official, jurist, and nonprofit executive currently serving as the 10th president of the Carnegie Endowment for International Peace. He was previously a Justice of the Supreme Court of California, the Stanley Morrison Professor of Law at Stanford University and director of Stanford's Freeman Spogli Institute for International Studies, and an executive branch official in the Clinton and Obama administrations. His publications address problems in American public law, international affairs and international law, artificial intelligence, public health and safety law, and institutions and organizations. He serves on the State Department's Foreign Affairs Policy Board. A member of the American Academy of Arts and Sciences and the National Academy of Sciences Committee on the Social and Ethical Implications of Computing Research, he serves as chair of the board of the William and Flora Hewlett Foundation. He was born in Northern Mexico.

The Carnegie Endowment for International Peace (CEIP) is a nonpartisan international affairs think tank headquartered in Washington, D.C., with operations in Europe, South and East Asia, and the Middle East as well as the United States. Founded in 1910 by Andrew Carnegie, the organization describes itself as being dedicated to advancing cooperation between countries, reducing global conflict, and promoting active international engagement between the United States and countries around the world. It engages leaders from multiple sectors and across the political spectrum.