Dr. Georg Wieselthaler is director of the Heart Transplant and Mechanical Circulatory Support programs at UCSF. He is one of the world's leading experts in mechanical circulatory support for end-stage heart failure patients. Over the past 30 years, Wieselthaler has been instrumental in devising ways to make heart pumps smaller, lighter and easier to implant. He has also performed and supervised more than 800 heart transplants.