Rudolph C. Hatfield, PhD, is a neuropsychologist, educator, and writer. He served as staff neuropsychologist for the University of Michigan and the Center for Neuropsychology, Learning and Development and has taught courses in experimental psychology, psychopathology, biopsychology, and abnormal psychology. He is a member of the International Neuropsychological Society and the author of The Everything Guide to the Human Brain. He lives in Saginaw, Michigan.