Steve Stagner, the executive chairman, president and chief executive of Mattress Firm, has resigned from the nation's largest mattress retailer, the Houston Chronicle reported. Mattress Firm's board of directors said yesterday that it had begun the search for a new chief executive. Stagner, who began his career as the owner of the largest Mattress Firm franchisee, joined the Houston retailer's corporate office in 2005. After becoming chief executive in February 2010, he oversaw Mattress Firm's initial public offering in 2011. He stepped down as chief executive in March 2016, but remained chairman. Stagner was reappointed chief executive in March 2018, five months before Mattress Firm filed for chapter 11 bankruptcy. The company emerged from bankruptcy in November.