AnonymousUnknown author · Public domain

Wrote Security Analysis (1934) and The Intelligent Investor (1949), the two books that established value investing as a discipline built on distinguishing a stock's price from the actual worth of the business behind it. He taught at Columbia Business School, where one of his students was Warren Buffett, who later called Graham the most influential person in his life after his own father. Graham also advocated for index funds decades before they existed as a product.