Ms. Madison, 40, was previously senior vice president and chief of operations at the Raleigh, N.C.-based agency.
Ms. Madison is one of only 13 women chief operating officers at national agencies.
Ms. Madison has been with McKinney for 11 years, starting as a senior broadcast producer. She was named chief of operations in 2001, helping to land the agency's new office space at the American Tobacco Campus in Durham, N.C. The office relocates in spring 2004.
The move is part of a restructuring at the agency, which added public relations and design units. In June, the agency lured Dave Cook, a former executive creative director at New York independent Mad Dogs & Englishmen, to head the agency's account for Audi of America. Other recent hires include Lee Newman, from Publicis Groupe's Fallon, as account group director on Audi and Denis Budniewski as group account director on Nasdaq.