Mary Kay Fenton

Mary Kay Fenton


Mary Kay currently serves as Chief Operating Officer and Chief Financial Officer (CFO) of Semma Therapeutics, an operating subsidiary of Vertex Pharmaceuticals (Nasdaq: VRTX). She joined Semma Therapeutics from Achillion Pharmaceuticals, which she joined in 2000 and where she later served as Executive Vice President and CFO from 2006 to 2018. At Achillion, Mary Kay was a key member of the executive team and played an instrumental role in the company’s growth, including overseeing multiple public and private capital raises, and leading financial and operational functions.

Prior to joining Achillion, she held various positions within the Technology Industry Group at PricewaterhouseCoopers LLP, an independent registered public accounting firm, from 1991 to 2000, most recently as Senior Manager responsible for the life sciences practice in Connecticut. Mary Kay holds an M.B.A. in Finance from the Graduate School of Business at the University of Connecticut and an A.B. in Economics from the College of the Holy Cross.

Contact Information