Tadashi Okuyama is Professor Emeritus at the University of Hyogo, Japan, where his research has explored organic reaction mechanisms, acid-base catalysis, and heteroatom chemistry, and his teaching has included organic chemistry and advanced courses in physical organic chemistry. He has published a number of textbooks in Japanese, and has also translated a number of English language texts for the Japanese market.Howard Maskill is a Visiting Professor in the Department of Chemical and Biological Sciences, University of Huddersfield, UK, having retired as Senior Lecturer in 2004. His research explores the mechanism of reactions of organic compounds in solution.