It is with heavy hearts that one of our esteemed colleagues and ABPdN Diplomates, Dr. Leonard F. Koziol, has recently passed away. Dr. Koziol had an extraordinary career as a clinical neuropsychologist with specialty board certifications in Neuropsychology and Pediatric Neuropsychology. He was a fellow of the American Academy of Pediatric Neuropsychology, the American Board of Professional Neuropsychology, the National Academy of Neuropsychology, and the International Neuropsychological Society. Dr. Koziol was a prolific researcher and writer, authoring many books, book chapters, and peer reviewed journal publications, with his recent work focusing on the role of cerebellar functions on cognition, and has contributed greatly to our understanding of this complex network of brain regions (please see his website for the exhaustive list of contributions, http://www.leonardkoziol.com). In addition to his research and writing, he has taught at several institutions and supervised aspiring neuropsychologists, and provided clinical consultation and forensic and expert testimony in legal proceedings through his private practice. He will be greatly missed and we extend our condolences to his family as they mourn his loss.