Christopher Kemp Christopher Kemp is a molecular biologist specializing in neurodegenerative diseases at Michigan State University. Kemp is the author of Dark and Magical Places: The Neuroscience of Navigation. He lives with his family in Grand Rapids, Michigan. Neuropsych The mystery of how “place cells” in the brain map out your physical environment Your brain is remarkably good at mapping out physical spaces — even if it's an imaginary space like Hogwarts. But how does the brain do it?