Michael McCallister is the former Chairman of the Board and CEO of Humana Inc. Mr. McCallister joined Humana, a health care company offering insurance products and health and welfare services, including insurance products sold directly to consumers, in 1974 and served as its Chief Executive Officer from February 2000 until his retirement in December 2012. During his tenure as CEO Mr. McCallister led numerous M&A transactions, had significant oversight responsibility for the company’s compliance, human capital management and marketing and sales functions and gained research and development experience through oversight of the company’s development of insurance products for governments, individuals and companies. Mr. McCallister also served as Chairman of the Board of Humana from August 2010 to December 2013.

In addition to his service on the Zoetis Board of Directors, Mr. McCallister currently serves as a member of the Board of Directors of AT&T (since February 2013) and Fifth Third Bank (since November 2011). Mr. McCallister formerly served on the Board of Directors of National City Corp. Mr. McCallister also served for many years on the Board of the Business Roundtable and was Chairman of its Health and Retirement Task Force. Mr. McCallister holds a bachelor’s degree in Accounting from Louisiana Tech University and an MBA from Pepperdine University. Mr. McCallister’s senior management experience in the healthcare industry and operational expertise, along with his public company board experience, make him a valuable member of our Board.