Tom Harrison


Thomas Harrison, is the former Chairman Emeritus of Diversified Agency Services (DAS), the world’s largest group of marketing services companies and a division of the Omnicom Group. While leading DAS, Harrison acquired and managed a long and influential list of relationship marketing and branding companies.

Harrison joined Omnicom in 1992 when Harrison & Star Business Group, a rapidly growing healthcare advertising and communications, marketing education, public relations group, was acquired. Under Harrison’s leadership, the DAS division of Omnicom grew through organic and acquisitive growth to the world’s largest holding company of marketing services firms.

With an advanced degree in cell biology and physiology, Harrison began his business career at Pfizer Laboratories as a professional sales representative and later left Pfizer as marketing director.