Engineer. Doctor of Engineering. Born Sendai City, Miyagi Prefecture. Graduated from Electrical Engineering Department of Tohoku University (1923). Served as engineer of Tokyo Municipal Government and chief researcher of 1st Section of Electricity Research Institute and thereafter assumed his present post. Later served as member of Expert Advisory Committee of Kogyo Hyojun Chosakai (Industrial Standard Research Institute) and Gakujutsu Shorei Shino-ikai (Science Encouragement Council).