Contributor(s): Sir Ronald Cohen | Sir Ronald Cohen is a founder of the private-equity industry in Europe and one of the world's leading private equity investors. At the age of 26, he co-founded the firm that became Apax Partners. When he stepped down from the chairmanship thirty-three years later, Apax was the largest global private-equity firm founded in Europe. He is currently chairman of Bridges Ventures and The Portland Trust. He was knighted in 2001 for his services to venture capital.