James S. Walker, Ph.D., ABPP is a forensic neuropsychologist and the Director of Clarity. He is double-boarded in both neuropsychology and forensic psychology. Formerly the Director of Forensic Services at Vanderbilt University School of Medicine, Dr. Walker has been performing fitness for duty evaluations for more than 20 years. He has testified more than 200 times in forensic cases, often in matters that have received national attention. He is well-known and respected as an objective, fair, and understandable expert witness.