In this special edition of Ad Chatter, Dan Goldgeier talks with legendary British Creative Director Steve Harrison. Topics include Steve’s new book, “Can’t Sell Won’t Sell,” groupthink in the ad industry, the difference between the “somewheres” and “anywheres,” where advertising recruits its talent, when it’s right to take on social causes, and why Sir Martin Sorrell might pull a Keith Richards and outlast us all.