Tim Trefren is an angel investor who previously co-founded and served as CEO of Mixpanel. See sector focus and contact routes.
Tim Trefren is an angel investor who previously co-founded and served as CEO of Mixpanel, a leading product analytics company he built after Y Combinator in 2009, and currently leads Recheck, a climate tech startup focused on solar sales transparency. His investment thesis targets early-stage startups addressing climate change, food security, and economic development, with a focus on climate innovation. While specific check sizes and lead/follow behavior are not publicly documented, his background as a founder who raised over $277 million suggests experience with significant capital deployment. Notable portfolio companies include Mixpanel, which achieved over $100 million in annual revenue and a $1.05 billion valuation, and Recheck, his current venture in residential solar verification. Trefren holds a computer science degree from Arizona State University and served as a Climate Tech Fellow at On Deck, reflecting his distinctive point of view on climate tech accountability. He has not published public writing on investing, but his operational focus on transparency in solar sales distinguishes his approach.
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