Partner profiles
Thomas Brennan
Founding Partner
Founding Partner at Lakefusion since 2012, leading Series A and B investments in sustainable agriculture and climate tech across North America. Oversees portfolio governance and LP relations for the firm’s $280M fund. Previously VP at Cargill Ventures, where he ran three agri exits and built experience across commodity markets and field operations.
Sarah Kowalczyk
General Partner
General Partner at Lakefusion, leading the firm’s sustainable agriculture thesis and serving on the boards of four portfolio companies including Verdant Soil Co. and Fieldspan Analytics. Focuses on soil biology, carbon farming, and precision input investments at Series A. Previously 12 years in precision ag operations; holds a PhD in soil biogeochemistry from Purdue University.
Marcus Webb
General Partner
General Partner at Lakefusion, leading the carbon markets and biomaterials investment thesis. Board member at ClearCarbon and Mycoform Materials. Joined the firm in 2022 after the acquisition of his carbon credit platform, bringing direct founder experience to diligence and portfolio support in this sector.
Elena Ruiz
Partner
Partner at Lakefusion leading deal sourcing, LP relations, and ESG reporting across the portfolio. Built and manages the firm’s impact measurement framework, tracking carbon, water, and yield outcomes across 31 portfolio companies. Holds an MBA from Booth; previously in McKinsey’s agriculture practice focused on ag supply chain transformation.
David Liang
Venture Partner
Venture Partner at Lakefusion advising portfolio companies on go-to-market strategy and enterprise customer acquisition in water tech and climate markets, where sales cycles run 12–18 months and channel relationships drive outcomes. Brings founder credibility from two prior water tech exits to diligence and portfolio support work.