Sharon Callahan
LLNS, an Omnicom Group Company


For more than 25 years, Sharon Callahan has delved into all aspects of strategic healthcare marketing, and gained sharp skills in numerous disciplines including publishing, medical education, clinical programs, advertising, and digital. Sharon has spent her career helping clients to leverage the value of their messages through the seamless integration of multiple communication channels.

Sharon is CEO of LLNS, an integrated healthcare communications group of companies that has global capabilities in professional, consumer, and economic buyer promotion as well as public relations. Over the past five years, Sharon has led global agency consolidations across disciplines and geographies for several of Omnicom’s largest healthcare clients, and along the way has developed engaging innovative approaches for teamwork between agencies and their clients. Sharon seeks to capitalize on the increasing desire of clients to select strong agency teams that can execute complete communications solutions across multiple audiences on a worldwide basis. Sharon was well trained for her current role in the more than two years she spent as Executive Vice President and Director of DAS Healthcare, Division of Omnicom Group.

Prior to joining Omnicom, Sharon was Chief Digital Strategist at GHG and president of Summit Grey, in interactive agency born out of a company she co-founded, The Summit Group. Sharon had the good fortune to hone her skills at two entrepreneurial companies — and SCP Communications, where she spent 15 years getting some of the best experience in the industry.

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