Peggy Anne Salz, host of Mobile Presence, continues the Mobile Heroes podcast series focusing on app marketing experts. Next is David Yi, a UA expert who has managed mobile ad campaigns for top name games companies including Storm8. David talks about the pivotal role of data in performance and shares how an organized approach to tracking and testing can deliver a whopping 300x increase in performance. Award-winning filmmaker Shahab Zargari explains what influencer marketing is and how you can get started.