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    • Merck & Co., Inc., Rahway, NJ, USA is known as MSD outside of the United States and Canada.

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Merck & Co., Inc., Rahway, NJ, USA is known as MSD outside of the United States and Canada.

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Company > Leadership > Executive team

Executive team

Our executive team manages the day-to-day operations of our company. Our leaders come from all areas of the business to help position us to succeed.

Photo of Robert M. Davis

Robert M. Davis

Chairman and chief executive officer

Photo of Sanat Chattopadhyay

Sanat Chattopadhyay

Executive vice president and president, MSD Manufacturing Division

Photo of Richard R. DeLuca, Jr.

Richard R. DeLuca, Jr.

Executive vice president and president, MSD Animal Health

Photo of Cristal N. Downing

Cristal N. Downing

Executive vice president and chief communications & public affairs officer

Photo of Chirfi Guindo

Chirfi Guindo

Chief marketing officer, Human Health

Photo of Michael A. Klobuchar

Michael A. Klobuchar

Executive vice president and chief strategy officer

Photo of Dean Y. Li, M.D., Ph.D.

Dean Y. Li, M.D., Ph.D.

Executive vice president and president, MSD Research Laboratories

Photo of Caroline Litchfield

Caroline Litchfield

Executive vice president and chief financial officer

Photo of Steven C. Mizell

Steven C. Mizell

Executive vice president and chief human resources officer​

Photo of Jannie Oosthuizen

Jannie Oosthuizen

President, MSD Human Health U.S.

Photo of Joseph Romanelli

Joseph Romanelli

President, Human Health International

Photo of Dave Williams

Dave Williams

Executive vice president, chief information & digital officer

Photo of Jennifer Zachary

Jennifer Zachary

Executive vice president and general counsel


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Our leadership team

Meet the leaders who guide our purpose to use the power of leading-edge science to save and improve lives around the world.

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Diversity & inclusion

Our workforce represents the people we serve

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Environmental, Social & Governance (ESG)

Supporting society, people and communities around the world is fundamental to our long-term success

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