Kohl is the co-chief executive officer and managing partner of The Riverside Company, a private equity investment firm based in Cleveland, Ohio and New York, New York. Kohl joined The Riverside Company as Co-CEO with Co-CEO Béla Szigethy in 1993. Prior to joining The Riverside Company, Kohl was a vice president at Citicorp Venture Capital, the private equity arm of Citibank. Before joining Citicorp Venture Capital, Kohl was chief operating officer for National Cooperative Business Association in Washington, D.C.