Applied sport psychology practice and research date back to the late 19th century. During this period investigators have largely examined the interventions practitioners employ to help athletes. More recently, researchers have begun addressing the person employing those interventions, including identifying their attributes and how they develop expertise, in recognition that practitioners are central to effective practice. Research focused on practitioners can inform educational and registration pathways, helping trainees to develop the knowledge, skills, and characteristics needed to meet their clients’ needs. In this article major lines of inquiry in this area are reviewed. It is suggested that examining practitioner identity represents novel research that has educational and applied value.