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.

Here's what you should know about Kroger CEO Rodney McMullen, who resigned following "a board investigation of his personal conduct."

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