Shizume joined Kanto Seiki Co., Ltd. (present: Marelli Corporation) as a new grad in 1984. In 2020 he transferred to Marelli Cabin Comfort Japan (present: Highly Marelli Japan Corporation). He consistently worked in accounting-related departments. After the launch of a Mexico subsidiary, he worked as the head of the accounting & administrative department and was also responsible for institutional accounting, including the introduction of IFRS and the settlement & disclosure operations for the Japanese subsidiary. In management accounting he worked as the global controller (monthly management reporting, budgeting, forecasting and variance analysis, etc.). At Space BD, as a member of the corporate team he is responsible for accounting duties. He is from Saitama Prefecture.