Agencies | People Stoller Hops from Omnicom to IPG By Kiran Aditham on Aug. 17, 2011 - 10:32 AM Nearly two years to the day that he left Organic for the second time to join up with sister Omnicom agency BBDO as EVP, director of digital strategy for North America, Chad Stoller is once again moving on and assuming a role at ri ...