Nobuyuki Yoshikawa received the Ph.D. degrees in electrical and computer engineering from Yokohama National University, Japan in 1989. Currently he is a professor of the Department of Electrical and Computer Engineering, Yokohama National University. He is also a chair of the Superconducting Electronics Committee of the Japan Society for the Promotion of Science (JSPS) and the Technical Committee on Metal and Ceramics of the Institute of Electrical Engineering of Japan. His research interests include superconductive devices and their application in digital and analog circuits. He is also interested in single-electron-tunneling devices, quantum computing devices, and cryo-CMOS devices. He has led the Superconductivity Electronics Group in Yokohama National University. He is an expert in the field of superconductivity electronics and the foremost active researcher of superconducting logic. He has published more than sixty articles on single-flux-quantum (SFQ) and adiabatic quantum flux parametron (AQFP) circuits or closely related topics in the past five years alone.