Our Cardiologists
Brian Z. Bilchik, MD, FACC
Managing Director
Brian Z. Bilchik, MD graduated from the University of Witwatersrand Medical School in Johannesburg, South Africa in 1989. He completed his residency training at St. Mary’s Health Center, St. Louis, Missouri, and his fellowship in Cardiovascular Disease at Brigham and Women’s Hospital. Dr. Bilchik is Board Certified in Cardiovascular Disease, Internal Medicine, Echocardiography, and Nuclear Cardiology. Dr. Bilchik focuses on second opinions, coronary disease, valvular heart disease, and arrhythmias. He is passionate about wellness, physical activity, and prevention. He has been involved in national and global research and educational programs. He is an Assistant Professor in Medicine at Harvard Medical School. Dr. Bilchik joined the Lown staff in 1997.
Dr. Bilchik is an avid exerciser; he holds a black belt in karate and plays squash or cycles most days. Exercise is his favorite prescription. Dr. Bilchik's newest passion is kiteboarding.
Brian Z. Bilchik, M.D., F.A.C.C
Managing Director
Brian Z. Bilchik, MD graduated from the University of Witwatersrand Medical School in Johannesburg, South Africa in 1989. He completed his residency training at St. Mary’s Health Center, St. Louis, Missouri, and his fellowship in Cardiovascular Disease at Brigham and Women’s Hospital. Dr. Bilchik is Board Certified in Cardiovascular Disease, Internal Medicine, Echocardiography, and Nuclear Cardiology. Dr. Bilchik focuses on second opinions, coronary disease, valvular heart disease, and arrhythmias. He is passionate about wellness, physical activity, and prevention. He has been involved in national and global research and educational programs. He is an Assistant Professor in Medicine at Harvard Medical School. Dr. Bilchik joined the Lown staff in 1997.
Dr. Bilchik is an avid exerciser; he holds a black belt in karate and plays squash or cycles most days. Exercise is his favorite prescription. Dr. Bilchik's newest passion is kiteboarding.
Charles M. Blatt, M.D., F.A.C.C
Charles M. Blatt, MD graduated from the Columbia University College of Physicians and Surgeons in 1978 and completed his residency at Beth Israel Hospital, Boston and his fellowship in Cardiovascular Disease at Brigham and Women’s Hospital. Dr. Blatt is Board Certified in Cardiovascular Disease and Internal Medicine. His clinical work has focused on the management of patients with coronary and valvular heart disease, atrial fibrillation, and the impact of psychological stress upon the heart. He has directed several research projects focusing on the roles of depression and anxiety in coronary artery disease. He is an Assistant Professor of Medicine at Harvard Medical School. Dr. Blatt joined the Lown staff in 1984.
Dr. Blatt is an outdoorsman and enjoys sailing in the summer months and skiing in the winter. He walks daily as part of routine exercise.
Charles M. Blatt, MD, FACC
Charles M. Blatt, MD graduated from the Columbia University College of Physicians and Surgeons in 1978 and completed his residency at Beth Israel Hospital, Boston and his fellowship in Cardiovascular Disease at Brigham and Women’s Hospital. Dr. Blatt is Board Certified in Cardiovascular Disease and Internal Medicine. His clinical work has focused on the management of patients with coronary and valvular heart disease, atrial fibrillation, and the impact of psychological stress upon the heart. He has directed several research projects focusing on the roles of depression and anxiety in coronary artery disease. He is an Assistant Professor of Medicine at Harvard Medical School. Dr. Blatt joined the Lown staff in 1984.
Dr. Blatt is an outdoorsman and enjoys sailing in the summer months and skiing in the winter. He walks daily as part of routine exercise.
Naomi Kenmotsu Rounds, MD
Joining Lown Group July 1, 2026!
Naomi Kenmotsu Rounds, MD, graduated from the University of Rochester School of Medicine and completed her Internal Medicine residency and Cardiovascular fellowship at Brigham and Women’s Hospital in 1998. She is Board Certified in Cardiovascular Medicine.
Before joining the Lown Group, Dr. Rounds practiced at South Shore Cardiology for 25 years, serving as Managing Partner and Medical Director. During her tenure, she helped build the practice into the largest single-specialty provider of cardiovascular care on the South Shore.
Dr. Rounds has extensive experience caring for patients with all types of heart disease, including coronary artery disease, valvular heart disease, arrhythmias, heart failure, and preventive cardiovascular management. She believes the best medical care begins with truly understanding each patient — not only their symptoms and medical history, but also the personal, professional, and lifestyle factors that shape their overall well-being. Her approach is collaborative and grounded in evidence-based medicine, with a focus on guiding patients to maintain health, vitality, and purpose throughout every stage of life.
Outside of medicine, she enjoys spending time with her family and staying active through Pilates, walking, and cooking.
Dara Lee Lewis, MD, FACC
Medical Director,
Co-Director Women's Cardiology Program
Dara Lee Lewis, MD graduated from Harvard Medical School in 1992. She trained in Internal Medicine and Cardiovascular Disease at Brigham and Women’s Hospital. Prior to joining the Lown Group, she was on the staff of Presbyterian Heart Group in Albuquerque, NM. Dr. Lee Lewis is Board Certified in Cardiovascular Disease, Echocardiography, and Nuclear Cardiology. She is an Assistant Professor of Medicine at Harvard Medical School, and is actively involved in medical education. Her professional interests include cardiac imaging, preventive cardiology, women’s cardiac health, and general cardiology issues including coronary artery disease and valvular heart disease. Dr. Lee Lewis also has a special interest in the management of patients experiencing cardiac symptoms of Lyme disease and POTS (Postural Orthostatic Tachycardia Syndrome). Dr. Lee Lewis joined the Lown staff in June 2013.
Dr. Lee Lewis is a former college coxswain and varsity field hockey player. Now an avid walker and advocate of a healthy and balanced lifestyle, she has a strong interest in the role of nutrition on overall health. In addition, she emphasizes the importance of a healthy lifestyle and non-pharmacologic therapies in the prevention and management of cardiac disease.
Naomi Kenmotsu Rounds, MD
Joining Lown Group July 1, 2026!
Naomi Kenmotsu Rounds, MD, graduated from the University of Rochester School of Medicine and completed her Internal Medicine residency and Cardiovascular fellowship at Brigham and Women’s Hospital in 1998. She is Board Certified in Cardiovascular Medicine.
Before joining the Lown Medical Group, Dr. Rounds practiced at South Shore Cardiology for 25 years, serving as Managing Partner and Medical Director. During her tenure, she helped build the practice into the largest single-specialty provider of cardiovascular care on the South Shore.
Dr. Rounds has extensive experience caring for patients with all types of heart disease, including coronary artery disease, valvular heart disease, arrhythmias, heart failure, and preventive cardiovascular management. She believes the best medical care begins with truly understanding each patient — not only their symptoms and medical history, but also the personal, professional, and lifestyle factors that shape their overall well-being. Her approach is collaborative and grounded in evidence-based medicine, with a focus on guiding patients to maintain health, vitality, and purpose throughout every stage of life.
Outside of medicine, she enjoys spending time with her family and staying active through Pilates, walking, and cooking.
Dr. Rounds is excited to join the Lown Medical Group and contribute to its mission of delivering personalized, patient-centered cardiovascular care.
Dara Lee Lewis, M.D., F.A.C.C
Medical Director,
Co-Director Women's Cardiology Program
Dara Lee Lewis, MD graduated from Harvard Medical School in 1992. She trained in Internal Medicine and Cardiovascular Disease at Brigham and Women’s Hospital. Prior to joining the Lown Group, she was on the staff of Presbyterian Heart Group in Albuquerque, NM. Dr. Lee Lewis is Board Certified in Cardiovascular Disease, Echocardiography, and Nuclear Cardiology. She is an Assistant Professor of Medicine at Harvard Medical School, and is actively involved in medical education. Her professional interests include cardiac imaging, preventive cardiology, women’s cardiac health, and general cardiology issues including coronary artery disease and valvular heart disease. Dr. Lee Lewis also has a special interest in the management of patients experiencing cardiac symptoms of Lyme disease and POTS (Postural Orthostatic Tachycardia Syndrome). Dr. Lee Lewis joined the Lown staff in June 2013.
Dr. Lee Lewis is a former college coxswain and varsity field hockey player. Now an avid walker and advocate of a healthy and balanced lifestyle, she has a strong interest in the role of nutrition on overall health. In addition, she emphasizes the importance of a healthy lifestyle and non-pharmacologic therapies in the prevention and management of cardiac disease.
Naomi Kenmotsu Rounds, MD
Joining Lown Group July 1, 2026!
Naomi Kenmotsu Rounds, MD, graduated from the University of Rochester School of Medicine and completed her Internal Medicine residency and Cardiovascular fellowship at Brigham and Women’s Hospital in 1998. She is Board Certified in Cardiovascular Medicine.
Before joining the Lown Medical Group, Dr. Rounds practiced at South Shore Cardiology for 25 years, serving as Managing Partner and Medical Director. During her tenure, she helped build the practice into the largest single-specialty provider of cardiovascular care on the South Shore.
Dr. Rounds has extensive experience caring for patients with all types of heart disease, including coronary artery disease, valvular heart disease, arrhythmias, heart failure, and preventive cardiovascular management. She believes the best medical care begins with truly understanding each patient — not only their symptoms and medical history, but also the personal, professional, and lifestyle factors that shape their overall well-being. Her approach is collaborative and grounded in evidence-based medicine, with a focus on guiding patients to maintain health, vitality, and purpose throughout every stage of life.
Outside of medicine, she enjoys spending time with her family and staying active through Pilates, walking, and cooking.
Dr. Rounds is excited to join the Lown Medical Group and contribute to its mission of delivering personalized, patient-centered cardiovascular care.
Dara Lee Lewis, M.D., F.A.C.C
Medical Director,
Co-Director Women's Cardiology Program
Dara Lee Lewis, MD graduated from Harvard Medical School in 1992. She trained in Internal Medicine and Cardiovascular Disease at Brigham and Women’s Hospital. Prior to joining the Lown Group, she was on the staff of Presbyterian Heart Group in Albuquerque, NM. Dr. Lee Lewis is Board Certified in Cardiovascular Disease, Echocardiography, and Nuclear Cardiology. She is an Assistant Professor of Medicine at Harvard Medical School, and is actively involved in medical education. Her professional interests include cardiac imaging, preventive cardiology, women’s cardiac health, and general cardiology issues including coronary artery disease and valvular heart disease. Dr. Lee Lewis also has a special interest in the management of patients experiencing cardiac symptoms of Lyme disease and POTS (Postural Orthostatic Tachycardia Syndrome). Dr. Lee Lewis joined the Lown staff in June 2013.
Dr. Lee Lewis is a former college coxswain and varsity field hockey player. Now an avid walker and advocate of a healthy and balanced lifestyle, she has a strong interest in the role of nutrition on overall health. In addition, she emphasizes the importance of a healthy lifestyle and non-pharmacologic therapies in the prevention and management of cardiac disease.
Shmuel Ravid, MD, MPH, FACC
Shmuel Ravid, MD, MPH, received his MD from the Technion – Israel Institute of Technology in 1982 and Master of Public Health from Harvard University. After training in Internal Medicine and Cardiology in Israel, Dr. Ravid completed fellowships in Cardiovascular Disease (Brigham and Women’s Hospital) and Cardiac Electrophysiology (Lahey Clinic/New England Deaconess Hospital). He is Board Certified in Cardiovascular Disease and Internal Medicine. His clinical and research interests include management of cardiac arrhythmias, atrial fibrillation, and long-term outcomes of coronary artery disease. He is an Associate Professor of Medicine at Harvard Medical School. Dr. Ravid joined the Lown staff in 1987.
Dr. Ravid is a former Director and President of the Lown Cardiovascular Group, and has a special interest in rhythm disorders.
Shmuel Ravid, MD, MPH, FACC
Shmuel Ravid, MD, MPH, received his MD from the Technion – Israel Institute of Technology in 1982 and Master of Public Health from Harvard University. After training in Internal Medicine and Cardiology in Israel, Dr. Ravid completed fellowships in Cardiovascular Disease (Brigham and Women’s Hospital) and Cardiac Electrophysiology (Lahey Clinic/New England Deaconess Hospital). He is Board Certified in Cardiovascular Disease and Internal Medicine. His clinical and research interests include management of cardiac arrhythmias, atrial fibrillation, and long-term outcomes of coronary artery disease. He is an Associate Professor of Medicine at Harvard Medical School. Dr. Ravid joined the Lown staff in 1987.
Dr. Ravid is a former Director and President of the Lown Cardiovascular Group, and has a special interest in rhythm disorders.
Shmuel Ravid, MD, MPH, FACC
Shmuel Ravid, MD, MPH, received his MD from the Technion – Israel Institute of Technology in 1982 and Master of Public Health from Harvard University. After training in Internal Medicine and Cardiology in Israel, Dr. Ravid completed fellowships in Cardiovascular Disease (Brigham and Women’s Hospital) and Cardiac Electrophysiology (Lahey Clinic/New England Deaconess Hospital). He is Board Certified in Cardiovascular Disease and Internal Medicine. His clinical and research interests include management of cardiac arrhythmias, atrial fibrillation, and long-term outcomes of coronary artery disease. He is an Associate Professor of Medicine at Harvard Medical School. Dr. Ravid joined the Lown staff in 1987.
Dr. Ravid is a former Director and President of the Lown Cardiovascular Group, and has a special interest in rhythm disorders.
