Celebrated speaker, author, cancer specialist, and CBS News contributor David Agus, MD discusses his long and varied career in the field of medicine on today's episode of Redefining Medicine. As Professor of Medicine and Engineering at the University of Southern California's Keck School of Medicine, Dr. Agus has also co-founded Navigenics--a personal genomics company--and published New York Times and international bestsellers "The End of Illness" and "A Short Guide to a Long Life." His research has focused on the uses of technology to model cancer, in addition to the development of new therapeutic protocols to treat the disease.