Dr. Masaru Tateno is Chairman of the Executive Board of Tokiwa Hospital, Sapporo, Japan. In addition, Dr. Tateno serves as Clinical Professor, Department of Neuropsychiatry, Sapporo Medical University, School of Medicine, Sapporo, Japan. His specialty is child and adolescent psychiatry, and his clinical interests focus on autism spectrum disorder (ASD) and ADHD. His research concerns include behavioral addictions, such as Internet addiction and gaming disorder, and gender dysphoria in childhood. Dr. Masaru Tateno obtained a medical doctor license in 1997, and a Ph.D. degree in 2005. He has published more than 120 papers in international journals.