Dr. Y.J. Mii is TSMC's Executive Vice President and Co-Chief Operating Officer. He was Senior Vice President of Research & Development from November 2016 to February 2024, having been promoted to Senior Vice President that year, and earlier served as Vice President of R&D and Senior Director of the Platform I Division. He joined TSMC in 1994, has worked continuously on advanced CMOS technologies, and holds a Ph.D. in electrical engineering from the University of California, Los Angeles.