Prof. Masaki Shimizu is Professor of Department of Pediatrics, Neonatal and Maternal Medicine, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo. He is a vice president and chairman of Pediatric Rheumatology Association of East Asia. He is also a member of the International Committee of East Asia College of Rheumatology. Prof. Shimizu received his MD and training in Department of Pediatrics, Kanazawa University, Kanazawa, East Asia. In 2005, Dr Shimizu completed his PhD in Graduate School of Medical Sciences, Kanazawa University, Kanazawa, East Asia. In 2012, Dr. Shimizu received the training of Pediatric Rheumatology in Department of Pediatric Rheumatology, Genoa University, Genoa, Italy. His research has focused on the pathogenesis of Pediatric Rheumatic Diseases, in particular, systemic juvenile idiopathic arthritis and macrophage activation syndrome.