Representative Senior Managing DirectorSeiji Yamamori
| Apr. 2009 | Administrative Officer and General Manager of Network Operations Division of KDDI CORPORATION |
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| Apr. 2012 | Administrative Officer and General Manager of Engineering Division of KDDI CORPORATION |
| Apr. 2014 | Administrative Officer and Associate General Manager of Technical Planning Division of KDDI CORPORATION |
| Apr. 2017 | Managing Executive Officer and General Manager of Engineering Division of the Company |
| June 2017 | Managing Director and General Manager of Engineering Division and Business Development Department of the Company |
| June 2018 | Director of Okinawa Telecommunication Network Co., Inc.(present position) |
| Mar. 2021 | Managing Director and General Manager of Engineering Division and Smart Work Promotion Department of the Company |
| June 2021 | Representative Senior Managing Director , General Manager of Engineering Division and Smart Work Promotion Department of the Company (Present position) |