Dr. Roger Martin knows a lot about colleges. He’s attended them as a student, taught at them as a professor, and ran two of them as president. He even went back to school to write a book about what it would be like to be a 61-year old freshman. In his new book is “Off To College: A Guide for Parents,” he talks to everyone from cops to coaches, and hangs out everywhere from dorm rooms to drinking parties…all to give parents a sense of what happens when they drop their kid off and drive away. Dr. Martin joins us from New York City.