David Eagleman, Ph.D. is a neuroscientist at the Baylor College of Medicine, where he directs the Laboratory for Perception and Action as well as the Initiative on Neuroscience and Law. His scientific research is published in journals from Science to Nature, and his neuroscience books include Re-wire: The Shape-Shifting Brain and Wednesday is Indigo Blue: Discovering the Brain of Synesthesia. He is also the author of the international fiction bestseller, Sum.