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He is currently a Professor of Medicine at Stanford where he serves as the Section Chief of Heart Failure, Cardiac Transplantation, and Mechanical Circulatory Support. He sees patients both in the clinic and in the hospital who have advanced heart failure or who have received cardiac transplantation or mechanical circulatory support.His research interests are in clinical outcomes in patients after transplant and mechanical support as well as novel approaches to immunosuppression. He has participated in many single-center and multi-institutional research studies and has published widely in the fields of transplant and mechanical support. He served as President of the International Society of Heart and Lung Transplantation in 2018.