Advanced Heart Failure Transplant Cardiology (AHFTC) Fellows

Petra Mamic, MD

Dr. Petra Mamic began her medical education in Croatia at the University of Zagreb. She then moved to the U.S., where she obtained a degree in Molecular Biology at Loyola University Chicago and an MD at Harvard Medical School. After completing her internal medicine training at Stanford, she stayed on as a Cardiovascular Medicine fellow and a postdoctoral research fellow in Department of Genetics. Her research focuses on the role of the gut microbiome in cardiovascular disease pathogenesis, development of complications, response to therapy, and long-term outcomes.  More Supported by the NIH F32 funding, she is currently studying the role of the gut microbiome-host metabolome interactions in development of insulin resistance in chronic heart failure.


Justin Parizo, MD

Dr. Justin Parizo is an Advanced Heart Failure and Transplant Cardiology fellow. Justin did his undergraduate training at UCLA in physiology and attended medical school at UCSF. While in medical school he was interested in infectious disease and received a Fulbright Fellowship to study malaria epidemiology in India. After completing medical school, Justin came to Stanford for Internal Medicine residency where his clinical interests shifted to cardiovascular medicine. As a resident, Justin received the Stanford Julian Wolfsohn Award for outstanding performance in internal medicine. Justin stayed at Stanford to do his cardiovascular medicine fellowship as well.  More During his cardiovascular medicine fellowship, Justin’s research focus was on outcomes, disparities, health policy, and cost-effectiveness research in heart failure and heart transplantation. During his third year he received funding under the NIH F32 mechanism for his grant entitled “Impact of race, socioeconomic status, and geography on disparities in access to heart transplant”, and he has continued this work during his Advanced Heart Failure and Transplant Cardiology Fellowship. In his free time, Justin likes to hike and go to the beach with his wife and daughter.


Calvin Tong, MD

Dr. Calvin Tong grew up in Hong Kong and Vancouver, British Columbia. He received his Bachelor of Science in Honors Physiology from the University of British Columbia. He subsequently attended medical school, and completed his Internal Medicine residency and Cardiology fellowship at the University of British Columbia. Dr. Tong has a diverse range of research interests and had conducted studies investigating the cardiovascular effects of PVCs during pregnancy, developing risk stratification models for pericardial effusion, using biomarkers to triage patients to heart function clinic, and understanding the impact of exercise in cardio-oncology patients.  More He is also involved in medical education and simulation-based training. Dr. Tong is looking forward to his Advanced Heart Failure and Transplant fellowship at Stanford University, with particular interests in VADs, cardiac amyloidosis, and cardio-oncology.