Dr. Aubrey de Grey is a biomedical gerontologist. As the Chief Science Officer of the SENS Foundation (a foundation working to develop widespread access to rejuvenation biotechnologies), author of numerous journal articles and books, and board member of a handful of editorial and scientific advisory boards, it is incontestable that Dr. Aubrey de Grey has dedicated his life to the science of combating the aging process. He received his BA and Ph.D. from the University of Cambridge, however, his original field was computer science. Dr. de Grey is a Fellow of both the Gerontological Society of America and the American Aging Association and sits on the editorial and scientific advisory boards of numerous journals and organisations. He has appeared on countless shows, was even featured in the Max Wexler documentary, How to Live Forever, and has also spoken at a number of world-renowned events, including TED.
A great many of de Grey's conference presentations and other appearances are archived in the depths of YouTube, as it happens. At some point when you have a spare few minutes, you might take a look at the full list. There are probably a few in there that you haven't seen, such as this presentation given earlier this year at TechFest 2012 in Bombay: