Waleed Hassanein, MD, is president, CEO and a director of TransMedics (Andover, Massachusetts). He founded the company in 1998 and led it through the clinical development, market launch and commercial rollout of the breakthrough Organ Care System (OCS) technology. The OCS is a medical device used for ex-vivo physiologic preservation and assessment of transplantable organs, in both the European and U.S. markets.