Walter A Winshall, Angel Investor at Walter Winshall, Boston, MA, United States — verified investor profile. See sector focus and contact routes.
Walter A. Winshall is the Principal and founder of Collaborative Seed and Growth Partners, an investment firm in Boston, MA that specializes in commercializing early-stage technology. He previously co-founded and chaired SilverPlatter International, a library information services company acquired by Wolters Kluwer in 2001, and holds an MIT electrical engineering degree plus a Harvard Law School diploma. Winshall focuses on pre-seed and seed-stage investments, primarily in AI, angel, and scout sectors within the Boston and New England startup ecosystem. His typical check sizes range from approximately $425,000 to undisclosed amounts, and he actively engages with portfolio companies in a collaborative, supportive capacity rather than strictly leading or following. Notable portfolio companies include PillPack, Harmonix (creators of Guitar Hero), StoryFit, Notion, and Rheaply. Winshall has made roughly 49 investments with 13 exits, including early backing of Harmonix and Techstars companies, reflecting a long track record since 1970 in tech commercialization. No distinctive public writing or unique point of view beyond his firm’s focus on early-stage
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