Unlike many of his filmmaking contemporaries, Michael Mann — director of “Thief,” “Heat,” and “Manhunter” — didn’t realize the medium could be his career until he was a student at the University of Wisconsin-Madison in the early 1960s. It was when he saw “Dr. Strangelove, or: How I Learned to Stop Worrying and Love the Bomb” that he realized film could be a viable job.