BOSTON (AP) — Gov. Charlie Baker's administration has tapped Brian Shortsleeve, a one-time political director for Mitt Romney, to serve in the newly-created position of chief administrator of the Massachusetts Bay Transportation Authority. In making the announcement Thursday, Baker called Shortsleeve a "proven leader" with a successful record of fixing and operating complex organizations of all sizes. Shortsleeve will work with a financial control board that was recently formed to oversee the struggling Boston transit system.