Peter Lynch, the former manager of the Fidelity Magellan Fund, is known as one of the most successful managers of mutual funds in different periods of history. One of the key principles of Peter Lynch's investment is "Invest in what you know."

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Peter Lynch is one of the most famous and successful investors in the world.  He managed the Magellan Investment Fund for 13 years and was able to increase the return of the fund to 29.2% per year, which was more than double the performance of the S&P 500 index during the same period.