Dr. Yasunobu NAGATAKI was in charge of R & D of ultra-high-strength steel sheets for automobiles in Steel Research Laboratory after joining JFE Steel (former NKK) in April 1989. From April 2015 to March 2018, he held posts of the general manager of Sheet Products and Coated Products Research Department. From April 2018 to March 2022, he was the assistant director of Steel Research Laboratory. The present post of Dr. Yasunobu NAGATAKI since April 2022 is Fellow, one Executive of JFE Steel.