Considered the grandfather of sport psychology in North America, who wrote 'Psychology of Coaching' and 'Psychology of Athletes'?

Coleman Griffith is recognized as the "grandfather of sport psychology" in North America due to his pioneering contributions to the field in the early 20th century. His works, such as 'Psychology of Coaching' and 'Psychology of Athletes,' laid foundational principles for understanding the mental aspects of athletic performance. Griffith was among the first to apply psychological principles to sports and emphasized the importance of mental training for athletes. His research and writings provided insights that contributed significantly to the development of techniques and strategies to enhance athletes' performance through psychological means. This established the groundwork for modern sports psychology and influenced many subsequent researchers and practitioners in the field.