As founder and principal of Rule29, Justin Ahrens exemplifies the firm's philosophy of Making Creative Matter®. Like any creative professional, Justin enjoys digging into a business problem and designing a strategic solution. But he gets a bigger charge out of seeing the positive impact that solution can make—for the client and for the world. On this episode of Design Matters, Debbie Millman talks to Justin Ahrens about designing for social change and his new book.