William Cohn is a cardiac surgeon and medical device engineer who personally builds and prototypes devices in machine shops rather than only directing teams, and holds 90-120+ U.S. patents that became core IP for multiple venture-backed device companies like TVA Medical and BiVACOR. He has devoted decades to developing total artificial hearts, including co-leading the first successful implantation of a continuous-flow, pulseless total artificial heart and serving as the surgical force behind BiVACOR's magnetically levitated total artificial heart.