Seth Andrew Klarman is an American billionaire investor, hedge fund manager, and author. He is a proponent of value investing. He is the chief executive and portfolio manager of the Baupost Group, a Boston-based private investment partnership he founded in 1982.

Value investing is an investment paradigm that involves buying securities that appear underpriced by some form of fundamental analysis. All forms of value investing derive from the investment philosophy taught by Benjamin Graham and David Dodd at Columbia Business School in 1928 and subsequently developed in their 1934 text Security Analysis.