David Swensen of Yale has produced annual returns of 16.3 percent over 21 years.

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The man behind that investment success is David Swensen, one of the most gifted investors in the world.

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David Swensen, the well-regarded CIO for Yale University and author of Unconventional Success, highlights co-investment as one of the characteristics of the best money managers.

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For instance, when analysts began to report that university endowments performed better with a focus on longer term asset classes (the David Swensen approach), fund allocations followed the learning.

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