Taisei Theo C. ^{Ultimate Decision-Maker}

Senior Manager, CEO Office – Strategic Investment Management Group at SoftBank Group

Current Job Duration: 11 mos (until March 2026)

HEADLINE:
SoftBank CEO Office | Strategy & Ops | MBA Berkeley Haas

PERSONAL SUMMARY:
Strategic leader with experience driving large-scale AI investment initiatives at SoftBank Group Corp and building high-growth business operations at a global SaaS company.

Within the Office of Masa Son, I coordinate cross-company AI priorities leveraging SoftBank’s $200B Net Asset Value, support executive decision-making, and oversee key workstreams for Stargate—a $500B AI infrastructure initiative led by SoftBank, OpenAI, and Oracle. My work spans data center, energy, semiconductor, and robotics domains, requiring deep collaboration with internal and external stakeholders to translate Masa’s AI vision into execution at global scale.

Previously, as VP of Strategy and Operations at Kintone, I built and scaled U.S. operations, led market expansion, and contributed to corporate governance as a board member of Cybozu, one of Japan’s most successful public SaaS companies.

Fluent in English and Japanese, I frequently engage with senior leaders, partners, and large audiences in both languages.

Proficiencies:
✓ Strategic planning and execution across large-scale global organizations
✓ Market analysis, investment evaluation, and risk assessment
✓ KPI design, operational frameworks, and milestone delivery
✓ Go-to-market strategy and business operations
✓ Executive alignment, agenda-setting, and Chief of Staff responsibilities
✓ Public speaking in English and Japanese

Languages: English, Japanese

EDUCATION:
School: University of California, Berkeley, Haas School of Business
Degree: Master of Business Administration - MBA
Activities: None

School: University of California, Berkeley
Degree: Bachelor's, Political Science & Pre-Medicine curriculum
Activities: None

School: Sciences Po
Degree: Campus de Paris, Political Science and International Relations
Activities: None

School: The Wheatley School
Degree: Old Westbury, NY
Activities: None

Number of Followers:
1520