S teven Klinsky is a self-made American billionaire who is the founder and CEO of the private equity firm, New Mountain Capital. After a career as a lawyer and as a co-founder of the leveraged buyout group at Goldman Sachs, he founded his own firm in 1999. He has since built New Mountain into a major player in the private equity industry, with tens of billions of dollars in assets under management.

New Mountain's strategy is to focus on investing in high-quality, defensive growth companies in non-cyclical industries, such as healthcare, software, and business services. The firm is known for its deep industry expertise and its focus on building businesses rather than on financial engineering. The success of his private equity firm has made him a major figure in the investment world and a self-made billionaire. He and his wife are also major philanthropists, with a focus on education and poverty reduction.