Board Members

Chief Executive Officer Makoto Makita

After graduating from the Department of Information Engineering, Faculty of Engineering at Gunma University, he was instrumental in establishing security assessment teams at both SoftBank and CyberAgent. From 2010, he actively participated in the Ministry of Economy, Trade and Industry (METI) sponsored CTF Challenge Japan and DEFCON CTF, the world's largest hacking event, as a member of a Japanese hacker team, achieving notable results. In 2011, he founded IERAE SECURITY (now GMO Cybersecurity by Ierae, Inc.). To date, he has overseen approximately 900 security assessments and continues to engage in vulnerability assessment services.

  • OSCP
  • JGISP
  • CISSP
  • Technical Engineer (Network)
  • Technical Engineer (Information Security)
  • Information Security Administrator
牧田 誠

2005/ Joined SoftBank BB Corp.
2010/Joined CyberAgent Inc.
2011/Founder and CEO of the former Ierae Security Co., Ltd.
2021/Director of the Company (current position)
2021/Representative Director of the Company (current position)
2022/Director of GMO AI & Web3, Inc.
2023/CISO (Chief Information Security Officer) of GMO Internet Group, Inc.
Group Security Audit Office, Technology and Security Officer (current position)


Executive Vice President and CISO Takahisa Kishiya

Takahisa Kishiya has been at the forefront of network security since the mid-2000s. While at Japan's premier e-commerce company, he founded and headed the vulnerability assessment team, gaining extensive experience in assessing the security of websites and mobile applications. Currently, he oversees the Cybersecurity, Product Development, and Information Systems divisions.

  • OffSec Web Expert (OSWE)
  • AWS Certified Security – Specialty
  • Technical Engineer (Network)
  • Technical Engineer (Information Security)
  • Information Security Administrator

2006/Joined Rakuten, Inc.
2015/Joined the former Ierae Security Co., Ltd.
2016/Director of the company
2022/Director of the Company (current position)


Executive Managing Director COO Daizo Okoshi

1991/Joined Digital Technology Co., Ltd.
1998/Netvolt Co., Ltd. established
2000/Representative Director of Backbone Software Co., Ltd. (formerly NetVolt)
2011/CEO of Quest Software Co., Ltd.
2013/CommVault Systems Co., Ltd. Area Vice President
2015/Veeam Software Japan, Ltd. Country Director Japan and Korea
2017/President and CEO of Barracuda Networks Japan, Inc.
2022/Executive Officer, COO and Head of Sales Department
2024/Senior Executive Officer, COO and Head of Sales Division
2025/Appointed Director and Head of Sales Division (current position) of the Company


Director CFO So Tamaki

1996/ Joined Daiwa Securities Co., Ltd.
1999/ Joined Mitsubishi UFJ Securities Co., Ltd.
2008/ Joined Mizuho Securities Co., Ltd.
2017/ Joined JINS Co., Ltd.
2018/ Joined Baroque Japan Limited
2020/Joined Infcurion Co., Ltd.
2024/Executive Officer, CFO, General Manager of the Management Division
2024/Senior Executive Officer, CFO and Head of Corporate Division
2025/Appointed Director and Head of Corporate Headquarters of the Company (current position)


Director CGO Hikohiro Lin

Open CSIRT Foundation Certified SIM3 Auditor(公認監査人)

2003/Joined Matsushita Electric Industrial Co., Ltd. (now Panasonic Corporation)
2022/Joined PwC Consulting LLC
2024/Senior Executive Officer, General Manager of Global Strategy Division
2025/Appointed Director and General Manager of the Global Strategy Division of the Company (current position)


Director Hiroyuki Nishiyama

1999年/株式会社まぐクリック(現GMOアドパートナーズ株式会社) 入社
2000年/株式会社まぐクリック(現GMOアドパートナーズ株式会社) 代表取締役社長
2001年/インターキュー株式会社(現GMOインターネットグループ株式会社) 取締役
2003年/グローバルメディアオンライン株式会社(現GMOインターネットグループ株式会社) 常務取締役 グループメディア営業担当
2006年/株式会社まぐクリック(現GMOアドパートナーズ株式会社) 取締役会長
2007年/GMOインターネットグループ株式会社 専務取締役
2008年/GMOインターネットグループ株式会社 専務取締役 グループ事業部門統括
2010年/株式会社paperboy&co.(現GMOペパボ株式会社) 取締役
2013年/GMOインターネットグループ株式会社 専務取締役 グループ代表補佐 グループEC支援部門統括兼グループ人財開発統括
2015年/GMOインターネットグループ株式会社 取締役副社長 グループ代表補佐 グループEC支援部門統括兼グループ人財開発統括
2018年/GMOペイメントゲートウェイ株式会社 取締役
2019年/GMOインターネットグループ株式会社 取締役副社長 グループ代表補佐 グループ人財開発統括兼グループアライアンス推進室長
2022年/GMOインターネットグループ株式会社 取締役 グループ副社長執行役員・COO グループ代表補佐 グループ人財開発統括(現任)
2022年/当社取締役(現任)


External Director Masaki Yuda

2012/Joined Yahoo Japan Corporation
2018/Seconded to YJ Capital Co., Ltd. (currently Z Venture Capital Co., Ltd.)
2021/Joined Z Venture Capital Co., Ltd. (current position)
2024/Outside Director of the Company (current position)


External Director Yuki Kuwabara

2012/Joined Japan Research Institute, Ltd.
2018/Joined Innovation Network Corporation of Japan
2020/Outside Director of ExaWizards Inc.
2020/Joined JIC Venture Growth Investments Co., Ltd. (current position)
2020/Outside Director of the Company (current position)
2022/Outside Director of QunaSys Inc. (current position)
2023/Outside Director of Kyoto Fusioneering Co., Ltd. (current position)
2024/Outside Director of Power Diamond Systems Co., Ltd. (current position)

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