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Vasant "Vas" Narasimhan is an American physician and the chief executive officer of Novartis (since 2018).

Mr. Grey has served on our board of directors since September 2011 and as lead independent director of the Company since August 2012. Mr. Grey currently serves as president and chief executive officer at Lumena Pharmaceuticals, Inc. and is a venture partner at Pappas Ventures. Mr. Grey holds over 30 years of experience in the pharmaceutical and biotechnology industries, and has held senior positions at a number of companies, including president and chief executive officer of SGX Pharmaceuticals, Inc. (sold to Eli Lilly in 2008), president and chief executive officer of Trega Biosciences, Inc. (sold to Lion Bioscience in 2001) and president of BioChem Therapeutic Inc. For approximately 20 years, Mr. Grey served in various roles with Glaxo, Inc. and Glaxo Holdings, P.L.C., culminating in his position as vice president, corporate development and director of international licensing. Mr. Grey also serves on the board of directors of BioMarin Pharmaceutical Inc. and Selventa, Inc. Mr. Grey received a B.S. in chemistry from the University of Nottingham in the United Kingdom. Our board believes that Mr. Grey’s extensive experience managing pharmaceutical and biopharmaceutical companies will bring important strategic insight to our board as we plan Horizon’s future growth.