Stephen Wendel is the Principal Scientist at HelloWallet, where he's worked for five years to develop applications that help users take control of their finances. He is a behavioral social scientist by training, and studies how technology can drive beneficial behavior change. Stephen is the co-founder of Action Design DC, an event series with over 1000 practitioners and researchers building products to help users take action via behavioral economic techniques. His recent book, Designing for Behavior Change, gives a step-by-step approach to applying behavioral economics to product development.