Our Team

Preventive Cardiology team

The preventive cardiology team consists of physicians, nurses, researchers, receptionists, and technicians who each play a part in supporting different aspects of your cardiovascular care.

Learn more about our talented group of physicians and staff members on the preventive cardiology team at Stanford.

Our Physicians

David Maron, MDDavid Maron, MD

Dr. Maron is the director of the preventive cardiology clinic at Stanford Hospitals & Clinics and a clinical professor of cardiovascular medicine at Stanford University School of Medicine. He is board certified in internal medicine, cardiovascular disease, and clinical lipidology.

Dr. Maron received his medical degree from the University of Southern California and completed his residency in primary care internal medicine at the University of California, Los Angeles Medical Center. He completed a cardiology fellowship and a research fellowship in cardiovascular disease epidemiology and prevention at Stanford University.

Dr. Maron specializes in preventive cardiology with a focus on intensive risk factor management of patients with coronary artery disease and those at high risk. He treats patients with advanced lipid disorders and statin intolerance. He and the multidisciplinary Preventive Cardiology team provide nutrition and exercise counseling and genetic testing.

Joshua W. Knowles, MD, PhDJoshua W. Knowles, MD, PhD

Joshua Knowles is an attending physician in the Stanford Center for Inherited Cardiovascular Disease’s Familial Coronary Risk Clinic. He is currently a clinical instructor in the Division of Cardiovascular Medicine.

Dr. Knowles earned his MD and PhD from the University of North Carolina at Chapel Hill. He completed his internship, residency, and cardiology fellowship training at Stanford. His clinical interests include medical therapy for coronary artery disease and associated risk factors as well as insulin resistance. He is actively involved in several research projects with the goal of understanding the genetic basis of these conditions, and developing ways to translate these findings to clinical practice. His work has been funded by the National Institutes of Health and the American Heart Association.

Specialities: Coronary artery disease, preventive cardiology, and cardiovascular genetics.

Michael McConnell, MDMichael V. McConnell, MD, MSEE

Dr. McConnell is the director of the Preventive Cardiology Clinic. He is an associate professor of medicine and director of non-invasive imaging in the Division of Cardiovascular Medicine. He is also an attending physician in the echocardiography lab and the cardiology clinic.

Dr. McConnell graduated from MIT with degrees in electrical and biomedical engineering and received his MD from Stanford University in 1990. He did his internal medicine and cardiovascular medicine training at Brigham & Women's Hospital in Boston and then joined the faculty at the Brigham and Harvard Medical School in 1996. He returned to Stanford in the Division of Cardiovascular Medicine in 1998. As a result of his combined interest in cardiovascular disease and heart disease prevention, he joined the preventive cardiology team in 2002.

Specialties: Noninvasive imaging, preventive cardiology, and coronary artery disease.

Sandra TsaiSandra A. Tsai, MD, MPH

Dr. Tsai is an attending physician in the Preventive Cardiology Clinic and Women’s Heart Health. She is a clinical assistant professor in the Department of General Medical Disciplines and also attends in the Stanford internal medicine clinic.

Dr. Tsai graduated from Rice University with a bachelor's in biology and received her medical degree from University of Texas Southwestern Medical School in 1995. She completed her internal medicine residency training at UT Southwestern in 1998, obtained her MPH from University of California, Berkeley in 2003, and completed her post-doctoral research and preventive cardiology fellowship at the Stanford Prevention Research Center in 2010. She joined the Stanford clinical faculty in August 2010.

Specialties: Primary and secondary prevention of cardiovascular disease.

Our Staff

Jane Borchers, MPH, RDJane Borchers, MPH, RD

Jane is the dietitian for the Preventive Cardiology Clinic. She provides nutrition counseling to clinic patients regarding dietary measures to lower high cholesterol and triglycerides levels, to reduce high blood pressure and to improve blood glucose levels. She is responsible for dietary assessment for new clinic patients.

Jane received her masters in public health nutrition from University of California, Berkeley in 1986 and obtained her registered dietitian certification the same year.

Jane has worked on a number of cardiovascular risk reduction studies at Stanford Prevention Research Center. She has been dietitian for preventive cardiology since 1996.

Specialities: Cardiovascular nutrition for abnormal cholesterol, blood pressure, and elevated fasting glucose.

Mary Ann Champagne, RN, MSMary Ann Champagne RN, MSN, CNS

Mary Ann is a clinical nurse specialist and the nurse coordinator for preventive cardiology. She serves as the primary contact for all preventive cardiology patients and also is a patient care provider.

She received her bachelors degree from Seattle University and her masters and clinical nurse specialist degree from the University of California, San Francisco.

She has spent the majority of her professional career at Stanford in the area of risk reduction and prevention of cardiovascular disease; initially employed in the coronary care unit and then moving to primary and secondary prevention research and clinical practice. She has also been a medical supervisor in a local cardiac rehabilitation program for many years.

Specialties: Lifestyle and medication interventions for abnormal cholesterol, high blood pressure, and abnormal blood sugar.

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