Ernst Sack

Investment Stage

Focus Areas

About Investor

Ernst Sack is a Partner at Blue Bear Capital and helps manage the firm’s investment activities across energy, infrastructure, climate, software, and applied AI. Before Blue Bear, he spent nine years at Riverstone investing across energy technology, equipment, services, energy storage, and other industrial businesses. He has served on the boards of numerous energy and technology companies and has been an active independent investor in technology-enabled businesses since 2012. His investing perspective is particularly relevant to founders applying software, data, and AI to energy, infrastructure, industrial operations, and climate-related markets. He brings strong experience in board governance, energy markets, M&A, capital raising, and scaling companies that sell into complex industrial sectors. Founders can benefit from his ability to understand both software economics and the operational realities of asset-heavy industries. He is a strong fit for companies building digital or AI-driven solutions for climate, energy, and industrial customers.