- Joined KOKUSAI Securities Co., Ltd. (now Mitsubishi UFJ Morgan Stanley Securities Co., Ltd.)
- Joined MEX Co., Ltd.
- Joined FORVAL CORPORATION
- Joined SOFTBRAIN Co., Ltd
- Executive Officer of SOFTBRAIN Co., Ltd
- Director of Seer Insight Security Co., Ltd.
- Director of REALIT Co., Ltd.
- Joined Fidec Corp. (now Accretive Co., Ltd.)
- Standing Auditor of SOFTBRAIN Co., Ltd.(current position)