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Jack Welch

Identifying a person’s Myers-Briggs personality type based solely on their public persona is risky, admits Personalitypathways.com’s Ross Reinhold. But it’s possible to make good educated guesses. For instance, Jack Welch, the former chairman and C.E.O. of G.E., is likely an ENTJ (Extroverted, iNtuitive, Thinking, Judging). These people are visionary leaders and strategic commanders, Reinhold says.

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John Mack

The chairman and C.E.O. of Morgan Stanley is probably an ESTJ (Extroverted, Sensing, Thinking, Judging), says Reinhold. ESTJs tend to be analytical, systematic, and process-oriented.

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Bill Gates

The Microsoft chairman shows signs of being an INTJ (Introverted, iNtuitive, Thinking, Judging)—an independent-minded visionary and critical thinker.

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Meg Whitman

Reinhold pegs the eBay president and C.E.O. as an ENTP (Extroverted, iNtuitive, Thinking, Perceiving), inventive entrepreneurs who energize and inspire people.

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Warren Buffett

Although he's often labeled an ISTJ (Introverted, Sensing, Thinking, Judging) for his managerial prowess, Reinhold sees Buffett as a more reflective, analytically-inclined ISTP (Introverted, Sensing, Thinking, Perceiving). “I see him as a craftsman who started his apprenticeship very early in life, as a hobby, and possessed some superior intellectual skills that helped him hone his craft,” Reinhold says.

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Richard Branson

The founder of Virgin is likely an ESFP (Extroverted, Sensing, Feeling, Perceiving), who are known to be energetic performers and promoters. “They make work fun, live life to the fullest, and inspire those around them,” says Reinhold.

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Martha Stewart

Stewart shows signs of being a classic ESTJ (Extroverted, Sensing, Thinking, Judging), says Reinhold, because of her focus on order and efficiency.

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Steve Jobs

The Apple C.E.O. is probably an ENFP (Extroverted, iNtuitive, Feeling, Perceiving) , according to Reinhold, a type known for being enthusiastic leaders able to motivate and empower others. “Ultimately I think his ability to read and evaluate others, plus encourage, inspire, and motivate, are the key elements of his success,” Reinhold says.

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