J Mays, Ford Motor Co.'s global design chief and one of the last senior executives remaining from the Jacques Nasser era, is retiring from the company along with two other veteran senior executives. Moray Callum, 58, design director for Ford in North America, will replace Mays, 59, the automaker said in a statement today. Also retiring after long Ford careers are Jim Tetreault, 57, vice president of North American manufacturing, and Martin Mulloy, vice president of labor relations. Tetreault, a 36-year Ford veteran has been a key figure in revamping Ford's manufacturing strategy, while Mulloy helped shape agreements with the UAW that insured Ford's survival in the dark days of the financial crisis at the end of last decade. Mays, a native of Oklahoma, began his design career with Audi and had stints at BMW and Volkswagen before coming to Ford in 1997. He led development of a number of concept vehicles, including the Ford I...