Over a 40-year period, John has helped hundreds of organizations hire and retain top-performing professionals. John developed his statistically predictive algorithm for matching individuals to job roles, based on his experience playing and coaching professional hockey. He understood that there were powerful personality traits that drove a player’s “potential” success and differentiated a good player from a great player. Once he began studying the field of organizational psychology, he developed a theory behind these differences in people and then went about proving why certain “personality traits” were more critical than others in highly competitive work environments. Using advanced statistical methods and principles of applied organizational psychology, he developed the POP™ assessments, which for over 40 years have proven to be an extremely reliable predictor of performance and retention.   

Using these POP™ assessments with thousands of global companies has given SelfManagement Group to one of the largest database’s of predictive “selection” data and data models in the world.   Using these predictive assessments and Dr. Marshall’s study in how these personality traits predict performance on the job, he developed a training curriculum called The Principles of Self-Management which has helped tens of thousands program participants to increase their personal and professional effectiveness by developing the critical success habits that lead to high-performance. He has a doctorate in Psychology from York University in Toronto, where he also worked as an Assistant Professor prior to founding SelfManagement Group (SMG).