Under his leadership, Kroger has positioned itself as a formidable competitor to Walmart, Amazon, and other grocery giants.

Kroger board member Ron Sargent is taking the helm at the nation’s largest supermarket chain as questions about former CEO Rodney Mullen continue.

Kroger Chief Executive Rodney McMullen resigned from the company following a board investigation into his personal conduct, ending a more than four-decade career at the grocery chain.Kroger, the biggest U.