Ad Biz Friday Odds and Ends By Kiran Aditham on Jan. 13, 2012 - 4:19 PM -Former T3 SVP/ECD Glen Sheehan joined GSD&M as SVP/GCD across all accounts. -Inferno Group alum Kieron Monahan joined Arnold Worldwide as EVP, global planning director & global technology practice/co-lead for Dell. -If yo ...