He joined Fujitsu Limited, Kawasaki, Japan in 1979. His twenty-year R&D activity includes high-speed silicon bipolar (ECL), high-speed CMOS devices and their design with advanced physical models including full band Monte Carlo device simulation. He has ten-year business-leading experience concerning CMOS image sensors. He has published more than 60 papers and articles and contributed chapters to two books. He also holds 39 patents in Japan and 18 patents in the United States as well as 180-patent applications in Japan. He retired from Fujitsu Limited in June, 2013, and now is a freelance Technical Consultant. His main interest is the philosophical analysis of the difference between the Japanese and the Western people. He authored the series books, "Nihonjin no Genten o Mitsumenaosu - Gendai Nihon no Kadai no Honshitsu o Tou" i.e. "The Japanese origin is refocused- What is the fundamental problem of modern Japan ?" and two others in Japanese from 2012 to 2014.