Dave Davies

Ewan McGregor has played a heroin addict in Trainspotting, a young Obi-Wan Kenobi in three Star Wars films, and a poet in Moulin Rouge. In his latest film, Roman Polanski's Ghost Writer, McGregor plays an unnamed writer uncovering a political scandal. He recounts his favorite acting roles — and how he prepared for them.

William Halsted is credited with creating the United States' first surgical residency program and transforming the way operating rooms are sterilized. He was also a morphine addict. Plastic surgeon Gerald Imber details Halsted's dual lives in the new biography Genius on the Edge.

During his nine years as the coach of the Baltimore Ravens, Brian Billick led the team to a Super Bowl win in 2001. Now a commentator for Fox Sports and the NFL Network, he joins Fresh Air to discuss the upcoming Super Bowl — and the future of the NFL.