Office Depot Inc. (ODP) hired grocery executive Roland Smith as its new chairman and chief executive, crossing one major task off its to-do list a week after it closed a $1.2 billion merger with peer OfficeMax Inc.

The food-industry veteran has a longer list than usual of steps to integrate the two companies, because key decisions like where it would be based and how it would be led were intentionally put off until antitrust authorities signed off on the deal.

OfficeMax, the smaller company in the deal, insisted on leaving those questions open so it wouldn't shed customers and employees while the government reviewed the deal, two people close to the merger negotiations said. The caution was in part conditioned by a fear that the Federal Trade Commission could use the same reasoning to kill the deal as it did in 1997 when it rejected a proposed merger between Office Depot and Staples Inc. (SPLS).

The FTC approved the merger Nov. 1. Office Depot now needs to decide whether it will consolidate its head offices in Naperville, Ill., home to OfficeMax's headquarters, or in the standalone Office Depot's home base in Boca Raton, Fla. Mr. Smith, 59 years old, is based near Atlanta.

"I fully understand that we need to make a headquarters decision quickly," Mr. Smith said Tuesday.

Shares of the office supply chain rose 3.1% to $5.37 in after-hours trading. The executive appointment was effective immediately.

In addition to stitching together the two companies, Mr. Smith faces vast challenges as the office-supplies sector struggles with tougher competition from online sellers and shifting demand for office technology that has pressured sales.

He previously served as chief executive of Delhaize Group's (DEG, DELB.BT) U.S. division, owner of grocery chains Food Lion and Hannaford. He also led fast-food chains Arby's and Wendy's Co. (WEN). The West Point graduate served in the U.S. Army for seven years.

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