The Four Pillars of Investing, written by William J. Bernstein, is a finance book that provides a comprehensive guide to building a successful investment portfolio. Bernstein explains the four essential pillars of investing - theory, history, psychology, and business - and how they contribute to long-term investment success. This book covers a wide range of investment topics, including asset allocation, diversification, risk management, and market efficiency. It offers practical advice on how to construct a portfolio that aligns with your financial goals and risk tolerance. The Four Pillars of Investing is a valuable resource for both novice and experienced investors.