Neuropsychological evaluations are an integral part of neurorehabilitation service delivery. The contribution of neurocognitive and neurobehavioral data adds to that obtained from physicians (e.g., physiatrists), nursing staff, speech pathologists, physical therapists, occupational therapists, therapeutic recreation therapists, case managers, social workers, and vocational rehabilitation counselors. Neuropsychological results on a person with traumatic brain injury (TBI) of all levels can be applicable to all disciplines involved in comprehensive rehabilitation care given that the consequences of TBI are cognitive, behavioral, interpersonal, and physical in nature. Throughout history, the centrality of comprehensive assessments of those with acquired brain injury has been emphasized and provided the foundation to defining rehabilitation strategies that can be applied to the individual with TBI. The use of the term neuropsychology is often attributed to Sir William Osler in an address to the Phipps Psychiatric Clinic at Johns Hopkins Hospital in 1913. The practice of neuropsychology continues to change, often in response to demands and constraints of health care industry.