Aylwin Lewis joined Chicago-based Potbelly Sandwich Works as president and CEO. He succeeds founder Bryant Keil, who continues as chairman of the board. … Shari's Restaurants in Beaverton, Ore., appointed Bruce MacDiarmid as its CEO. MacDiarmid, who had been president-COO of Black Angus Steakhouse, succeeds Larry Curtis, who retired from Shari's in June. … Denny Marie Post resigned as senior vice president, global food and beverage, for Seattle-based Starbucks Corp. … Corpus Christi, Texas-based Whataburger Restaurants LP promoted Ed Nelson to chief financial officer from controller. Additionally, the chain named three new regional operations directors: Maureen Miller (Southeast); Joel Griffiths (South Texas); and Carlos Rodriguez (Southwest). … Vicorp Restaurants Inc., Denver-based operator of the Village Inn and Bakers Square chains, appointed Hazem Ouf as president and CEO. He succeeds Ken Keymer, who retired at the end of May. … Nicholas Flanagan was promoted to vice president of restaurant operations for Cracker Barrel Old Country Store Inc. in Lebanon, Tenn. Previously, he served as a regional vice president. … Wheat Ridge, Colo.-based Qdoba Mexican Grill promoted David Craven to director of marketing from manager of marketing, brand strategy, advertising and field marketing. … Steve Rockwell was named vice president of finance for Maryville, Tenn.-based Ruby Tuesday Inc. Previously, he was a securities analyst at Baltimore-based investment firm Brown Advisory. … Togo's Eateries Inc. in San Jose, Calif., named John Ramsay its vice president of development.