More than six months after Ron Johnson's departure, Apple has finally found a new retail chief to replace him, in one John Browett. The Cambridge- and Wharton-educated Browett comes to Cupertino after serving nearly five years as CEO of Dixons -- the Taj Mahal of British retail. Before that, he held a smattering of obscurely defined "executive positions" at Tesco plc and advised retail clients at Boston Consulting Group. In a statement, Apple CEO Tim Cook lauded his company's latest appointee, citin