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Kathy Mazzarella, chairman, president, and CEO of Graybar, started at the company when she was 19 years old. As one of only 24 female CEOs in the Fortune 500, Mazzarella has unique insights about leadership. She points to the need for general business expertise to make it to the top. This requires letting go of the comfort of a more specialized role to gain experience across a variety of business disciplines. She also emphasizes the importance of overcoming self-doubt to embrace new challenges.