Sir Niall Campbell Ferguson, HonFRSE (/niːl/ NEEL; born 18 April 1964) is a British-American historian who is the Milbank Family Senior Fellow at the Hoover Institution and a senior fellow at the Belfer Center for Science and International Affairs at Harvard University. Previously, he was a professor at Harvard University, the London School of Economics, New York University, a visiting professor at the New College of the Humanities, and a senior research fellow at Jesus College, Oxford. He was a visiting lecturer at the London School of Economics for the 2023/2024 academic year and at Tsinghua University in China from 2019 to 2020. He is a co-founder of the University of Austin.
Ferguson writes and lectures on international history, economic history, financial history, and the history of the British Empire and American imperialism. He holds positive views concerning the British Empire. In 2004, he was one of Time magazine's 100 most influential people in the world. Ferguson has written and presented numerous television documentary series, including The Ascent of Money, which won an International Emmy Award for Best Documentary in 2009. In 2024, he was knighted by King Charles III for services to literature.