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William F. Sharpe

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William Forsyth Sharpe is a highly influential American economist. He specializes in the study of financial markets and investment theories. His work provides mathematical frameworks to understand how risk relates to potential returns. Sharpe is a Professor of Finance, Emeritus, at the Stanford University Graduate School of Business. In 1990, he received the Nobel Memorial Prize in Economic Sciences for his major contributions. His theories help professionals manage money and evaluate how well investments are performing.

One of Sharpe's most significant achievements is the Capital Asset Pricing Model, known as CAPM. This model establishes a mathematical way to evaluate the relationship between risk and expected return. According to CAPM, the expected return of an asset equals the risk-free rate plus a premium. This premium is based on the asset's systematic risk, which is measured by a value called beta. Beta represents how sensitive an asset's returns are to the returns of the overall market. By using this formula, investors can better understand the specific risks they are taking on.

Beyond CAPM, Sharpe developed several other vital tools for financial analysis. He created the Sharpe ratio, which is used to analyze risk-adjusted investment performance. This ratio allows investors to see if their returns are worth the level of risk they accepted. He also contributed to the binomial method, which is used for the valuation of options. Additionally, he helped develop the gradient method for asset allocation optimization. He also created returns-based style analysis, which helps evaluate the performance and style of investment funds.

Sharpe's academic journey involved several changes in direction. He was born on June 16, 1934, in Boston, Massachusetts. During World War II, his family moved frequently before settling in Riverside, California. He initially enrolled at the University of California, Berkeley, to study medicine. Later, he moved to the University of California, Los Angeles, to study business administration. He eventually found his true interest in economics. He earned his B.A. in 1955, his M.A. in 1956, and his Ph.D. in 1961, all from UCLA.

While pursuing his Ph.D., Sharpe worked at the RAND Corporation. He studied under the supervision of Armen Alchian and worked closely with Harry Markowitz. Markowitz acted much like a dissertation advisor to him. In 1961, Sharpe began teaching at the University of Washington. He submitted his paper on CAPM to the Journal of Finance in 1962. Interestingly, the paper was initially rejected because editors thought it was irrelevant. It was not until 1964 that the paper was finally published. During this same period, John Lintner, Jan Mossin, and Jack Treynor independently developed the CAPM.

Sharpe's professional career moved from academia into the practical world of finance. He moved to the University of California, Irvine, in 1968, before joining Stanford University in 1970. At Stanford, he researched pension funds and portfolio allocation. He also provided consultancy services to major firms like Merrill Lynch and Wells Fargo. In 1986, he co-founded Sharpe-Russell Research to help pension funds with asset allocation. In 1996, he co-founded Financial Engines with Joseph Grundfest and Craig W. Johnson. This company uses technology to apply his financial theories to real-world portfolio management.

Today, the impact of Sharpe's work is visible in massive financial systems. Financial Engines has grown to include more than 200 employees. The company provides advice to employees at over 1,000 major corporations. It manages more than $200 billion in retirement accounts. In March 2018, the company was acquired for $3 billion in cash. Sharpe has also served as the President of the American Finance Association. He continues to be an advocate for adaptive asset allocation strategies. His life's work has fundamentally changed how the world approaches investment and risk.

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