Razorfish Exec Bolts for Mobile Ads Startup

Paul Gelb joins MoPub after five years with digital shop

Maximizing one's impact almost always requires a sharp focus. That concept seems to be at the center of Paul Gelb’s decision to leave Razorfish—where he helped the digital shop build its mobile practice for the last half decade—to become head of strategy at MoPub, a two-year-old mobile ad exchange that’s announcing the hire today (Sept. 18).

@Chris_Heine Christopher Heine is a New York-based editor and writer.