Dr. John den Boer specializes in providing mental performance training to athletes (with particular specialization in ball sport athletes like tennis and baseball). He received his internship training at VA Boston Healthcare System (Boston University School of Medicine/Harvard University) and received his postdoctoral training at Barrow Neurological Institute.

He has published extensively in the area of Clinical Neuropsychology and Sports Neuropsychology and has been an expert speaker at many local, national, and international conferences. He has consulted with many elite-level sports organizations, including the USOC, ATP/WTA tours, NCAA, MLB, NBA, and NFL. He is a USPTA-Elite and PTR Teaching Professional. He specializes in developing junior elite tennis players and helping them realize their dreams at playing college tennis.