Sheila Hernandez joined Summit in 1987 as a part-time marketing student intern while completing her undergraduate degree at the University of New Mexico. After earning her MBA, Sheila proceeded to take on the roles of Marketing Coordinator, Director of Marketing, Vice President of Marketing, Vice President, Chief Information and Technology Officer, and Vice President, Customer Experience Officer (CXO). She also led Summit's Internet presence, mobile app development, master product data management system, and market data analytics program. In 2022, she started her current role as Vice President, Marketing and Supplier Relations.

Active in the industry, Sheila spent nine years on the Marketing Committee and was member of the Futures Group Task Force for IMARK Group. She was elected to the Board of Directors for IMARK Electrical in 2018, making her the second female board member in IMARK’s history. She is currently serving her second three-year term. Sheila was one of 14 Inaugural Mentors in the Empowering Women Mentorship Program. She has served on numerous committees and task forces for the National Association of Electrical Distributors (NAED) and has been a panelist for Modern Distribution Management, NAED, IDEA and IMARK Group. Sheila is a Gold Level graduate of NAED's Electrical Products Education Course (EPEC) and Dare to Lead™ trained.

In her current role, Sheila leads the company’s marketing efforts, which have been expanded to include Category Management, Supplier Relations, Digital Presence and Customer Lifecycle.