Baruch S. Blumberg holds an M.D. from Columbia University and a Ph.D. in Biochemistry from Oxford University, where he has served as the Master of Balliol College. The editor of three books and the author of more than 400 scientific papers, he is Distinguished Senior Scientist at the Fox Chase Cancer Center and the Director of the NASA Astrobiology Institute. He was awarded the 1976 Nobel Prize in Physiology or Medicine for the work described in this book.