Charlotte, N.C. — Sonic Automotive, Inc., one of the nation’s largest automotive retailers, has added two industry leaders to its growing e-commerce team. Steve Wittman has joined as the company’s first chief digital retail officer, and Stephen Conrad has joined as the new vice president of e-commerce. Additionally, Sonic has appointed Marti Eulberg as chief creative officer, previously the company’s director of brand management. Wittman most recently served as vice president of global e-commerce at Hertz. He will report to Jeff Dyke, president of Sonic Automotive and EchoPark Automotive. As …