David Eagleman is a neuroscientist and a fiction writer.  During the day, he directs the Laboratory for Perception and Action and the Initiative on Neuroscience and Law at Baylor College of Medicine. He is best known for his work on time perception, synesthesia, and neurolaw.  At night, he is a fiction writer.  His debut work of fiction, Sum: Forty Tales from the Afterlives, became an international bestseller and is published in 22 languages.