Human Brain Electrophysiology: Evoked Potentials and Evoked Magnetic Fields in Science and Medicine by David Regan (Elsevier, 1989) is a comprehensive reference that charts the evolution and application of electrophysiological methods—specifically evoked potentials (EPs) and evoked magnetic fields—in both scientific research and clinical medicine. The book synthesizes conceptual, methodological, and clinical advances over nearly two decades, documenting how EPs, initially accessible only to specialized labs, became standard noninvasive tools for probing sensory, perceptual, cognitive, and emotional functions in the human brain. Regan’s work highlights the impact of new technology and analysis techniques, the increasing clinical utility of these methods for diagnosing neurological disorders, and the emergence of magnetic recordings as a crucial complement to traditional electrical measurements. Drawing on his extensive expertise, Regan provides an authoritative treatment of the subject, establishing the book as a foundational text for both researchers and clinicians in the burgeoning field of human brain electrophysiology.