With the finale of "Mad Men" airing last night, TV critic extraordinaire Alan Sepinwall spoke with the show's creator Matt Weiner to discuss the excellent fourth season. It's a fantastic interview where we get Wiener's take on the eternal "Who is Don Draper?" question, the relationship between Don (Jon Hamm) and Peggy (Elisabeth Moss) and the New York Times ad. It's a great way to say farewell to "Mad Men" for a year. Also, Sepinwall's recap of the finale is, as always, an insightful perspective on the episode.