Maureen Ryan has exited her post as the Chicago Tribune’s chief TV critic to join AOL Television.Ryan is highly regarded in biz circles as an influential critic and blogger. She’s spent the past 13 years with the Tribune. She joins AOL TV on Sept. 1. Ryan is the latest prominent newspaper TV critic to relocate to the online realm. The New Jersey Star-Ledger’s Alan Sepinwall joined HitFix.com in May.