Aubrey David Nicholas Jasper de Grey (/dre/; born 20 April 1963) is an English author and biomedical gerontologist, currently the Chief Science Officer of the SENS Research Foundation. He is editor-in-chief of the academic journal Rejuvenation Research, 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 to live indefinitely.