Samantha Jane Power (born September 21, 1970) is an Irish-American academic, Pulitzer Prize-winning author, and diplomat who served as the 28th United States Ambassador to the United Nations from 2013 to 2017. She is a member of the Democratic Party.

Power began her career as a war correspondent covering the Yugoslav Wars. From 1998 to 2002, she served as the Founding Executive Director of the Carr Center for Human Rights Policy at the Harvard Kennedy School, where she later became the first Anna Lindh Professor of Practice of Global Leadership and Public Policy. She was a senior adviser to Senator Barack Obama until March 2008, when she resigned from his presidential campaign after apologizing for referring to then-Senator Hillary Clinton as "a monster."

Power joined the Obama State Department transition team in late November 2008. She served as Special Assistant to the President and Senior Director for Multilateral Affairs and Human Rights on the National Security Council from January 2009 to February 2013. In April 2012, Obama chose her to chair a newly formed Atrocities Prevention Board. As U.N. ambassador, Power's office focused on such issues as United Nations reform, women's rights and LGBT rights, religious freedom and religious minorities, refugees, human trafficking, human rights, and democracy, including in the Middle East and North Africa, Sudan, and Myanmar. She is considered to have been a key figure in the Obama administration in persuading the president to intervene militarily in Libya. In 2016, she was listed as the 41st-most powerful woman in the world by Forbes.

Power is a subject of the 2014 documentary Watchers of the Sky, which explains the contribution of several notable people, including Power, to the cause of genocide prevention. She won a Pulitzer Prize in 2003 for her book A Problem from Hell: America and the Age of Genocide, a study of the U.S. foreign policy response to genocide. She has also been awarded the 2015 Barnard Medal of Distinction and the 2016 Henry A. Kissinger Prize.

Ambassador Samantha Power is the Anna Lindh Professor of the Practice of Global Leadership and Public Policy at Harvard Kennedy School and the William D. Zabel ’61 Professor of Practice in Human Rights at Harvard Law School.

From 2013 to 2017 Power served as the 28th U.S. Permanent Representative to the United Nations, as well as a member of President Obama’s cabinet. In this role, Power became the public face of U.S. opposition to Russian aggression in Ukraine and Syria, negotiated the toughest sanctions in a generation against North Korea, lobbied to secure the release of political prisoners, helped build new international law to cripple ISIL’s financial networks, and supported President Obama’s pathbreaking actions to end the Ebola crisis. President Obama has called her “one of our foremost thinkers on foreign policy,” saying that “she showed us that the international community has a moral responsibility and a profound interest in resolving conflicts and defending human dignity.”

From 2009 to 2013, Power served on the National Security Council as Special Assistant to the President and Senior Director for Multilateral Affairs and Human Rights, where she focused on issues including atrocity prevention; UN reform; LGBT and women’s rights; the promotion of religious freedom and the protection of religious minorities; and the prevention of human trafficking.

Called by Forbes “a powerful crusader for U.S foreign policy as well as human rights and democracy” when it named her one of the “World’s 100 Most Powerful Women,” Power has been recognized as a leading voice internationally for principled American engagement in the world. She has been named as one of Foreign Policy’s “Top 100 Global Thinkers” and has twice been selected as one of TIME’s “100 Most Influential People.”

Her book “A Problem from Hell”: America and the Age of Genocide won the Pulitzer Prize and the National Book Critics Circle Award in 2003. Power is also the author of the New York Times bestseller Chasing the Flame: One Man’s Fight to Save the World (2008) and the co-editor, with Derek Chollet, of The Unquiet American: Richard Holbrooke in the World (2011). Her most recent book, The Education of an Idealist: A Memoir (2019), was a New York Times, Wall Street Journal, and USA Today bestseller, and was selected as one of the best books of 2019 by the New York Times, Washington Post, Economist, NPR, TIME, Audible, and Christian Science Monitor.

Power began her career as a journalist, reporting from places such as Bosnia, East Timor, Kosovo, Rwanda, Sudan, and Zimbabwe. Before joining the U.S. government, Power was the founding executive director of the Carr Center for Human Rights Policy at the Kennedy School, a columnist for TIME, and a National Magazine Award-winning contributor to the Atlantic, the New Yorker, and the New York Review of Books.

Power earned a B.A. from Yale University and a J.D. from Harvard Law School. She immigrated to the United States from Ireland at the age of nine and today lives in Concord, Massachusetts with her husband, Cass Sunstein, and their two young children.

Ambassador Samantha Power is the U.S. Permanent Representative to the United Nations and a member of President Obama’s Cabinet. She formerly served as Special Assistant to the President and Senior Director for Multilateral Affairs and Human Rights at the National Security Council. Power also served as the Anna Lindh Professor of the Practice of Global Leadership and Public Policy at Harvard’s John F. Kennedy School of Government, where she taught courses on U.S. foreign policy, human rights, and extremism and where she was the founding Executive Director of the Carr Center for Human Rights Policy. She is the Pulitzer Prize winning author of "A Problem from Hell": America and the Age of Genocide (2002) and Chasing the Flame: Sergio Viera de Mello and the Fight to Save the World (2008), the basis for the award-winning HBO documentary, "Sergio." She is also the recent editor, with Derek Chollet, of The Unquiet American: Richard Holbrooke in the World (2011). Power has served as a columnist at Time Magazine and, in her journalism, has reported from such places as Bosnia, East Timor, Kosovo, Rwanda, Sudan, and Zimbabwe, and contributed regularly to the New Yorker Magazine, the New York Review of Books, and the New Republic. Power is a graduate of Yale University and Harvard Law School. She lives with her husband, Cass Sunstein, and their son Declan in Washington, DC.