287 Essays on Infinite Lifespans   Authors ing the two terms cybernetic and organism, as a concept for humans to survive space travel. Robert A. Freitas Jr., J.D. http://www.rfreitas.com/ Senior Research Fellow at the Institute for Molecular Manu- facturing, a molecular nanotechnology think tank in Palo Alto, California, Freitas was the first to publish a detailed technical design study of a medical nanorobot in a peer-reviewed main- stream biomedical journal. Freitas is the author of Nanomedi- cine, the first book-length technical discussion of the medical applications of nanotechnology and medical nanorobotics. Marc Geddes http://www.prometheuscrack.com/ With a special interest in artificial intelligence and mathemat- ics, Geddes is a freelance writer from Auckland, New Zealand. He has published a number of articles in various transhuman- ist media. Aubrey de Grey, Ph.D. http://www.gen.cam.ac.uk/sens/index.html University of Cambridge, UK. Serves on the board of direc- tors of the International Association of Biomedical Gerontol- ogy and the American Aging Association and on the editorial boards of the Journals Rejuvenation Research, Mitochondrion and Antioxidants and Redox Signaling. His research focus is to expedite the development of a true cure for human aging.