As a lawyer, he’s known to clients and colleagues as Christopher T. Miller. On the radio, he was better known as “Chris Payne.” “I would be reading case law while I was playing Smashing Pumpkins and Local H songs,” Miller said about a radio-hosting gig that partly coincided with his years in law school. Miller, a lawyer since 2003, became managing partner of Kelley, Kronenberg’s five-lawyer Chicago office last month. He joined the firm from SmithAmundsen LLC, where he worked for …