David Brewster is a Boston-based angel investor and climate tech entrepreneur with 25 years of experience building. See sector focus and contact routes.
David Brewster is a Boston-based angel investor and climate tech entrepreneur with 25 years of experience building mission-driven energy companies, notably co-founding and scaling EnerNOC to $500M in revenue before its 2017 sale to Enel Group[1][6]. His investment thesis centers on clean technology, big data analytics, and smart buildings, targeting pre-seed and seed stages[1][2]. While specific check sizes are not publicly detailed, he participated in LineVision’s $2M Series A round and has backed ReferralMob and LineVision as an individual investor[1]. His notable portfolio includes LineVision, a grid optimization firm, ReferralMob, and Leap, a Business/Productivity Software company in which he invested in November 2023[1][4]. Brewster distinguishes himself through active board roles at Vicinity Energy, Cortex Sustainability Intelligence, and PearlX Infrastructure, alongside advisory work for LineVision, Antin Infrastructure Partners, and the World Resources Institute[1][5]. He does not appear to have published public writing, but his distinctive point of view is reflected in his long-term commitment to climate tech and energy sector innovation[1][2].
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