Insa Nixdorf is a professor of psychology at the International University of Applied Sciences, Germany.

Raphael Nixdorf is a professor of health psychology at the International University of Applied Sciences, Germany.

Jürgen Beckmann is a professor, Emeritus of Excellence, at Technical University of Munich, School of Medicine and Health, Munich, Germany; Honorary professor, School of Human Movement and Nutrition Sciences at the University of Queensland, Australia; and Adjunct Professor Dept. of Physical Education and Sport Sciences at the University of Limerick, Ireland.

Scott B. Martin is a professor of performance psychology and Director of the Psychosocial Aspects of Sport and Exercise program at the University of North Texas, USA.

Tadhg MacIntyre is an assistant professor at the Department of Psychology, Maynooth University, Ireland.