Prof. S. Ohshima received the B.E., M.E. and D.E. degrees in Electrical Engineering from Tohoku University, in 1973, 1975 and 1978, respectively. During 1978-1988, he stayed in the Tohoku University to research on a search for new superconducting materials. He moved to the Yamagata University at 1988. From 1993 to 2015 he had been Professor of Yamagata University, and in studying on the HTS microwave devices, measurement technique of surface resistance under a high dc magnetic field and so on. He retired from the Yamagata University in 2015 and he continues to study of superconductivity as professor emeritus.