Dieter Kotte is CEO of Causal Impact, Statistics and Management Consulting, Germany. He is also the Secretary and International Strategic Advisor of the International Nature and Forest Therapy Alliance (INFTA). Qing Li is a Senior Assistant Professor in the Department of Hygiene and Public Health at Nippon Medical School, Japan. His academic specialities include forest medicine, environmental immunology, and immunotoxicology.Won Sop Shin is a Professor in the Department of Forestry at Chungbuk University, Republic of Korea and a retired Minister of the Korea Forest Service. He specialises in the use of forests for public health. Andreas Michalsen is a Director in the Department of Integrative and Internal Medicine of Immanuel Hospital, Berlin, and Chair of Clinical Integrative Medicine at Charité-University Medical School, Germany. His research interests include naturopathy, traditional medicines, and public health.