Aubrey David Nicholas Jasper de Grey is an English author and biomedical gerontologist. He is the author of The Mitochondrial Free Radical Theory of Aging (1999) and co-author of Ending Aging (2007). He is known for his view that medical technology may enable human beings alive today not to die from age-related causes. As an amateur mathematician, he has contributed to the study of the Hadwiger–Nelson problem in geometric graph theory, making the first progress on the problem in over 60 years. De Grey is an international adjunct professor of the Moscow Institute of Physics and Technology, a fellow of the Gerontological Society of America, the American Aging Association, and the Institute for Ethics and Emerging Technologies. He has been interviewed in recent years in a number of news sources, including CBS 60 Minutes, the BBC, The Guardian, Fortune Magazine, The Washington Post, TED, Popular Science, Playboy, The Colbert Report, Time, the Skeptics' Guide to the Universe, and The Joe Rogan Experience. He was the Chief Science Officer of the SENS Research Foundation. In late 2022, de Grey formed LEV Foundation as President and Chief Science Officer.