John R. Sinnenberg

John is the chairman and co-founder of Cyprium Partners, a private equity firm that primarily makes “sponsorless” non-controlling mezzanine and equity investments in privately owned lower middle-market companies. Cyprium is currently investing out of Fund IV, a 2014 vintage fund with $460 million in committed capital. John founded Key Principal Partners, a predecessor group in 1998 simultaneously establishing Cyprium Investors.