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Jay Robert "J. B." Pritzker (born January 19, 1965) is an American venture capitalist, entrepreneur, philanthropist, and private business owner based in Chicago. He is managing partner and co-founder of the Pritzker Group, a private investment firm that operates middle-market service and industrial companies and invests in digital technology companies. He is a member of the Pritzker family, and has an estimated net worth of $3.4 billion.