New York City Police Commissioner Bernard Kerik. Mayor Rudolph Giuliani appointed him the 40th police commissioner of the City of New York in August of 2000. Prior to that, he was the commissioner of the Department of Correction. Kerik began as a prison warden in New Jersey. He joined the NYPD as a beat cop on Times Square. He just written a book, called The Lost Son: A Life in Pursuit of Justice.