He received a Doctorate of Science from the University of Tokyo in 1983. He trained as a Ramsay Memorial Fellow at the Department of Inorganic and Structural Chemistry, University of Leeds, England (1987–1989). Dr. Matsuo’s research interests are the environmental evaluation by the state analysis of elements. His attention has been paid to chemical states of iron (oxidation states, coordination, magnetic properties, etc.) that are involved in various environmental or geochemical samples using Mössbauer spectroscopy and XAFS.