In his book, Leonard Levitt examines the lines of power that often result in the NYPD's police commissioner and mayor duking it out for "publicity, credit and power." Levitt's "NYPD Confidential: Power and Corruption In the Country's Greatest Police Force" is based in his experiences covering the department as a columnist for Newsday. In the book, he covers the high and low points of the administrations of William Bratton, Howard Safir, Bernie Kerik and current commissioner Ray Kelly.