Tatsuya Atsumi, MD, PhD, Professor of Medicine in the Faculty of Medicine, Hokkaido University in Japan, is the head of the department of Rheumatology, Endocrinology and Nephrology. After graduating at Hokkaido University in 1988, he has spent most of his carrier as a researcher in Sapporo, except 3 years in the Lupus Unit, St. Thomas’ hospital in London (1994-1997). His research interest includes clinical and basic aspect of systemic autoimmune diseases such as antiphospholipid syndrome, systemic lupus erythematosus, rheumatoid arthritis and other rheumatic diseases. He has over 400 research publications dealing with several aspects of rheumatology, in particular, with the pathogenesis, diagnosis and treatment of antiphospholipid syndrome. In addition, he is a member of faculty in a number of clinical trials for rheumatoid arthritis and lupus erythematosus.