Atsuyoshi Koike is senior vice president of technology and fab operations and president of SanDisk (Japan) Limited, the company's wholly-owned subsidiary in Japan. He joined SanDisk in August 2006 from Renesas Technology where he was a corporate chief engineer. Prior to that, Koike was president and chief executive officer of Trecenti Technologies, Inc. He also held various management positions at Hitachi Ltd. including general manager of the Semiconductor Manufacturing Technology Center. Koike earned his bachelor's and master's degrees in material science from Waseda University, Japan and his doctorate in electrical engineering from Tohoku University, Japan.