Kathleen "Kathy" Mazzarella has been the Chief Executive and President of Graybar Electric Co. since June 1, 2012.

She has a Bachelor of Arts in Applied Behavioral Sciences and a Master's degree in business from Webster University which she earned in 2002.

[24] Her views on human resources strategy were included as a chapter in Inside the Minds, a book featuring interviews with top HR practitioners across the United States.

In 2011, she received the Outstanding Alumna Award from the George Herbert Walker School of Business & Technology at Webster University.

[27] In 2015, she earned the Women in Industry Trailblazer Award from the National Association of Electrical Distributors[28] and was recognized as a Leader of Distinction by the YWCA of Metro St.