St. Louis, MO-based Graybar, No. 4 on MDM’s list of top electrical distributors, has made Kathleen M. Mazzarella the company’s 11th president and CEO, effective today.

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As president and CEO, Mazzarella oversees the day-to-day operations of the business and sets the strategic direction for Graybar’s sales and marketing efforts. She succeeds Robert A. Reynolds, Jr.

Reynolds will serve as Graybar’s executive chairman, overseeing the company’s strategy and providing guidance to the executive team.

Mazzarella is a member of Graybar’s board of directors and most recently served as executive vice president and COO. During her 32-year career with the employee-owned company, she has held leadership positions in sales, marketing, human resources and strategic planning.