Ph.D. in finance Martin Zweig is a growth investor with a serious conservative streak and is well-known to market professionals for his disciplined approach to the market. Zweig has examined the relationship between stock market action and every conceivable economic or market indicator. In fact, he's credited with inventing the put/call ratio market-sentiment indicator. Zweig described the results of much of his research in his best-selling book, “Martin Zweig’s Winning on Wall Street”.

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