John A. Walker, Ph. D., died unexpectedly on August 1, 2003. As a neuropsychologist at the University of California, San Francisco for 17 years, he dedicated his life to helping people with epilepsy. He will be fondly remembered for his powerful intellect, his calm demeanor, and his zealous support for the disadvantaged. Dr. Walker was born and raised in Milwaukee, Wisconsin. He was graduated from the University of Wisconsin with a degree in psychology. After earning his doctoral degree in psychology at the Johns Hopkins University in 1978, he became engaged in basic research on spatial memory. He later directed his investigative work toward clinical neuropsychological issues pertaining to individuals with epilepsy. He served on the faculty of the Cognitive Neuropsychology Laboratory at the Good Samaritan Hospital and Medical Center in Portland, Oregon. It was there that he developed his expertise in clinical neuropsychology. In 1986, Dr. Walker joined the neurology faculty at the University of California, San Francisco.