Mcdonald’s, though is doing some tinkering. The new head of the domestic division-jack M. Greenberg, a pleasant 54-year-old lawyer who has been with the company 16 years-has brought in a handful of new managers, including executives from Burker King, Boston Market, and General Electric Co. “ We are not afraid to do things differently”. Greenberg says. In a first for the burger gi-ant, Mcdonald’s in February bought a stake in another restaurant, a 14-outlet chain in denver called Chipotle Mexican Grill.