About the Author

Ray Kurzweil, Ph.D., is one of the world's leading entrepreneurs, thinkers, and futurists. A recipient of the National Medal of Technology, among many other honors, he is the author of three previous books: The Age of Spiritual Machines, The 10% Solution for a Healthy Life, and The Age of Intelligent Machines.

Terry Grossman, M.D., is a board certified physician of anti-aging medicine who has written several popular articles on natural treatments for ailments. An expert in longevity medicine, he is the author of a leading book on life extension, The Baby Boomer's Guide to Living Forever.