Correction: A previous version of this story misstated Lanetta Haynes Turner's salary as interim chief of staff as $186,000 annually. It is $154,000.

Mayor Rahm Emanuel’s future came into sharper focus with the news that he will write a book, set to be published in 2020, about the shift of power away from gridlocked state and federal governments and toward cities. Cook County Board President Toni Preckwinkle announced late Tuesday that her chief of staff had stepped down for personal reasons.