Mary Wells Lawrence, advertising visionary, trailblazer and legend, shares the simple advice that has led her to get everything she has ever wanted: Double Yourself.

Certainly, on a superficial level, we can say that all of the major Mad Men characters journeyed forth through significant life changes. But as much as these characters gained scars and wisdom through their journeys, none of them actually changed over the course of a decade.

Now that Betty's story is literally ending, we see her going back to school -- but it is no coincidence that her efforts for self-fulfillment are going to be cut short.