NEW YORK: Thomas Harrison will transition to chairman emeritus of Omnicom Group's Diversified Agency Services division on April 1.
Harrison joined Omnicom in 1992 when the holding company acquired the healthcare marketing communications group he co-founded, the Harrison & Star Business Group. He became president of DAS in 1997 and chairman and CEO of the division the following year. In 2011, Omnicom named Harrison chairman of DAS, with president Dale Adams succeeding him as CEO.
The DAS division includes more than 200 of Omnicom's marketing communications firms, such as Fleishman-Hillard, Ketchum, Porter Novelli, Cone Communications, Marina Maher Communications, and Mercury Public Affairs.