"I strive to perform the most effective breast surgery in the finest aesthetic way. I take the time to thoroughly explain each diagnosis and utilize treatment options based on the medical innovations and breakthroughs of twenty-first century breast care."

 

Our Doctors

Marie Pennanen, MD, FACS

Dr. Marie Pennanen, Director of the Chevy Chase Breast Center, is one of the most knowledgeable breast surgeons in the metropolitan Washington area. She has over twenty years of experience and has treated women from all over the world. Dr. Pennanen received her Bachelor of Science degree, magna cum laude, from Georgetown University and her Medical Degree with honors from New Jersey Medical School. She has been inducted into Phi Beta Kappa, Psi Chi (the international honor society in psychology) and Alpha Omega Alpha (the national medical honor society). She completed her surgical residency at George Washington University Medical Center where she received an award for research, and then joined the faculty at Georgetown University Medical Center and the Lombardi Cancer Center. As an Associate Professor of Surgery, she has been involved in research on the diagnosis, treatment and prevention of breast cancer, including ones supported by the prestigious National Cancer Institute. She is the author of numerous medical articles regarding breast cancer. She has received grants for her innovative programs which teach our next generation of doctors about comprehensive breast cancer care. Her passion is taking care of women with breast cancer, high risk for breast cancer or benign breast disease, one woman at a time, by providing state-of-the-art, personalized, compassionate care.

Dr. Pennanen is board certified by the American Board of Surgery and is a Fellow of the American College of Surgeons. She is a member of the American Society of Breast Surgeons. She is affiliated with Georgetown University Hospital, Sibley Memorial and Suburban Hospitals in the
Johns Hopkins Medicine System, and George Washington University Hospital. She has been consistently recognized by her peers as one of Washington’s Top Doctors in the field of Breast Surgery in Washingtonian magazine, and by her patients through the Patient’s Choice Award. She is proud to be the 2012 Honoree of Living in Pink, a foundation dedicated to the search for a cure for breast cancer. In additional to giving lectures to the medical community, she has been featured on multiple television and radio programs related to breast cancer.

Dr. Pennanen and her husband live in Washington, DC with their four children. In her free time she enjoys spending time with her family, classical music concerts, hikes through Rock Creek Park and beyond, and baking Italian and Finnish family recipes.

 

Thomas Zorc, MD, FACS

Dr. Zorc is a board certified general surgeon who has been in practice in Chevy Chase for over 20 years. He is a 1981 graduate of Georgetown University with a Bachelor of Science degree in Chemistry. He received his Doctorate in Medicine from the Georgetown University School of Medicine in 1985. He completed his surgical residency at Georgetown Hospital and the Washington Hospital Center in 1990. He is a fellow of the American College of Surgeons and is a member of the American Society of Breast Surgeons, the Society for Laparoendoscopic Surgery, and the American Medical Association. Dr. Zorc has been recognized by Washingtonian Magazine as one of the areas “Top Doctors” since 1999.

 

Elizabeth O’Leary

Dr. Elizabeth O’Leary is an accomplished breast surgeon who found her home at the Chevy Chase Breast Center. She received her Bachelor of Arts in Biology with a Minor in Spanish from the College of St. Benedict and her Doctor of Medicine with Honors from the University of Minnesota School of Medicine. She has been inducted into the Phi Rho Sigma Medical Society where she served as president and also into the Gold Humanism Honor Society. She received her Master of Health Science degree in Disease Control and Prevention from the Johns Hopkins Bloomberg School of Public Health and was awarded the Vaccine Science and Policy Certificate. In the Department of Oncology at Johns Hopkins, Dr. O’Leary continued her cancer research and was involved in many studies including an investigation of the human papilloma virus and its relationship to head and neck cancer and a trial of Herceptin in squamous cell carcinoma of the head and neck. Dr. O’Leary completed her surgical residency at the Medstar Washington Hospital Center, where she received an award for her research on Perioperative Normothermia as a Risk Factor for Surgical Site Infections in Patients Undergoing Mastectomy for Early Stage Breast Cancer and received first place in a competition for her research on creating a risk score for patients with small bowel obstructions. She has been recognized at both national and regional levels for her surgical research and has presented her research at the national meeting of the American College of Surgeons.

Dr. O’Leary is a member of the American College of Surgeons, the DC Chapter of the American College of Surgeons, the Georgetown Clinical Society, the American Medical Association, and the Montgomery County Medical Society. She is affiliated with Georgetown University Hospital as well as Sibley Memorial and Suburban Hospitals in the Johns Hopkins Medicine System. She was actively involved with the Women’s Cancer Resource Center in program development for the WCRC & Sisters in Harmony. She participated in a community-based initiative with emphasis on education and awareness and helped connect people to the resources in the community.

Dr. O’Leary’s most important role is taking care of her patients and providing a safe, reassuring place that will help them to easily navigate the confusing world of cancer, cancer therapies and benign breast diseases. Her patients come first and her greatest reward comes from being able to help patients through their most trying times, getting them to the other side and bringing a smile back to their hearts and faces.

Dr. O’Leary lives in Maryland with her husband and two children. In her free time, she enjoys ballroom dancing, playing cello, knitting, cooking and spending time with family.