The appointment of Fields, 51, was part of a sweeping overhaul of Ford's executive ranks unveiled today. Speculation about Fields' possible appointment has been ongoing for several weeks. Mulally is 67.
Joe Hinrichs, currently group vice president and head of Asia Pacific Africa, will succeed Fields. Hinrichs is currently president of the Asia Pacific Africa region.
The chief executive of T-Mobile, Philipp Humm, has resigned from the company to take a position with a company in Europe, All Things D reported Wednesday.