Ph.D. in Ecology from the University of Washington Graduate School, College of Forest Resources, USA, and subsequently participated in the Chennai-Sakhalin International Biodiversity Project at the University of Washington and the University of Hokkaido, and later as an overseas researcher from the Ministry of Education in Kenya. After that he started his career at the Center for Physiological Ecology, and after working at New York University and Saga University School of Medicine, he became a professor at the Institute of Tropical Medicine, Nagasaki University in 2006. His main research activities include studies of Plasmodium falciparum and dengue virus vectors, epidemiological studies on human subjects for mosquito nets and other control measures, and studies on the effects of climate change. He has conducted these studies while living in the field, mainly in Africa, since the 1990s. In recent years, he has also conducted research on malaria epidemic forecasting and projects to implement warning systems in southern Africa.