Jay Robert (J.B.) Pritzker (born January 19, 1965) is an American venture capitalist, entrepreneur, philanthropist and private business owner. He is managing partner and co-founder of 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 wealthy Pritzker family.In 2014, the Forbes 400 Richest Americans list ranked him as the 161st richest person in the U.S.