Nagumo is Professor Emeritus at Digital Hollywood University and Director of a Leading Color Research Laboratory. He has developed a new color system – based on color image charts used by more than 100,000 people in Japan – by applying his research on design theory and studies regarding technologies of representation. He is also a professor at the Communication University of China and Shanghai Conservatory of Music. In addition, he is Chairman of the Japan Color Image Association and the International Color Image Association. Professor Nagumo has a whole host of publications, including Color Image Charts.