Eiichi Tatsumi is a Fellow at the Council on International Law, Order, and Security (CILOS). At the Council, his work focuses on energy security, the energy transition, and the ways in which AI-driven electricity demand is reshaping power systems and the industrial competitiveness of allied economies.

Eiichi is the founder of Frontierbridge, an advisory firm focused on strategy and investment across the energy and data center sectors. He is also a Fellow at the Rajawali Foundation Institute for Asia at Harvard Kennedy School's Ash Center for Democratic Governance and Innovation, where his research focuses on the transformation of Asia's power systems and on energy and technology cooperation between Japan, Asia, and the United States.

He previously served as Head of U.S. Business at Renova, Inc., a publicly listed Japanese renewable energy company, where he led the company's entry into the United States and built its business platform through multiple investments. Before that, he spent more than a decade at Mitsui & Co., one of Japan's largest trading and investment houses, where he worked on international energy and infrastructure investments across multiple markets. That experience shaped his perspective on how capital, technology, and policy interact in the development of energy and infrastructure businesses.

He holds a Master in Public Administration from Harvard Kennedy School, an MBA from New York University's Stern School of Business, and a BA in History from the University of Tokyo.