Michael Kellmann is Head of the Sport Psychology Unit, Faculty of Sport Science, Ruhr University Bochum, Germany, and Honorary Professor at the School of Human Movement and Nutrition Sciences, The University of Queensland, Australia

Sarah Kölling is a researcher and lecturer at the Sport Psychology Unit, Faculty of Sport Science, Ruhr University Bochum, Germany. While creating this manual, she was also holding a post-doc position at Stellenbosch University, South Africa