John Butler Senior Vice President; President, Cardiometabolic & Renal John Butler joined Genzyme in 1997 as product manager for Renagel. His current responsibilities include leading the company's renal, endocrine, and cardiovascular businesses. This includes managing the commercial products Renagel, Renvela, Thyrogen, Hectorol, and Cholestagel as well as the development of Genzyme’s cardiometabolic and renal portfolio. Mr. Butler has also served as vice president of strategic planning, vice president of Renagel Europe, and senior vice president and general manager of the renal business unit. Prior to joining Genzyme, he worked in sales and marketing at Amgen Inc. Mr. Butler has an M.B.A. from Baruch College and a B.A. from Manhattan College.