Ad Biz | Brands Joel Ewanick Shakes It Up Some More By Kiran Aditham on Jan. 18, 2011 - 4:11 PM Joel Ewanick (does this guy ever sleep?) is wasting no time in flexing his muscle as GM’s new global CMO. A month after he was promoted to his post, Automotive News is reporting that the 50-year-old exec is once again shakin ...