LLNS and TBWA Worldhealth named Anne Devereux CEO.                       Devereux, formerly head of Omnicom sibling BBDO’s New York DTC practice, will serve as operational head of LLNS, replacing Al Nickel as CEO. Nickel continues as chairman of the network, while Steven Wice continues as president.Devereux will is also charged with coordinating the global agency network that comprises TBWA Worldhealth, which draws on agencies throughout Omnicom’s Diversified Agency Services (DAS) group. Serving as co-chairs of TBWA Worldhealth are Robert LePlae, president for TBWA North America, and Nick Baum, his counterpart for Western Europe.Taking over as head of DTC at BBDO New York will be Devereux’s deputy, Ray Hilton, who becomes EVP and senior account director. Under Devereux, the agency produced high-profile consumer campaigns for brands such as Schering-Plough’s Nasonex and GSK/Schering’s Levitra.