Dr. Jonathan S. Lowman

Carolyn H. Sigman, M.D., graduated with her bachelor's degree from Franklin and Marshall College in Lancaster, Pennsylvania. She earned her medical degree at Jefferson Medical College in Philadelphia. She then completed her internship and residency in internal medicine at Emory University. Following that, she served as chief resident at Emory University Hospital. Prior to joining Piedmont Physicians, Dr. Sigman was in private practice in Roswell and Alpharetta. With more than twenty years of experience, she is board certified in internal medicine and a member of the American College of Physicians. Dr. Sigman lives in Brookhaven with her husband, Steven Sigman, M.D., and their five children. Dr. Sigman welcomes new patients and accepts most insurance plans. Dr. Sigman is rated as an Advanced provider by MediFind in the treatment of Cyclic Vomiting Syndrome. Her top areas of expertise are Familial Hypertension, Glucocorticoid-Remediable Aldosteronism, Hypertension, and Sitosterolemia.

Marsha-Gail Davis, MD, MPH earned her medical degree from the University of California, San Diego, her MPH degree from San Diego State University and completed her internal medicine residency at Yale Primary Care Residency Program and her preventive medicine residency at University of California, San Diego. She received her undergraduate degree in Biology from Swarthmore College and is board certified in Internal Medicine by the American Board of Internal Medicine. She is a also board-certified in Preventive Medicine, Lifestyle Medicine and Obesity Medicine. She is originally from the beautiful island of Jamaica.Dr. Davis specializes in internal medicine, preventative medicine, lifestyle medicine and obesity medicine and combines all four specialties to assist her patients in living a long and healthy life and avoiding the morbidity and mortality that has become a familiar experience and expectation of many patients.Dr. Davis accepts most major insurance plans. Dr. Davis is rated as an Advanced provider by MediFind in the treatment of Cyclic Vomiting Syndrome. Her top areas of expertise are Familial Combined Hyperlipidemia, Xanthoma, Familial Hypopituitarism, and Cirrhosis.

Casimir Okoro is a primary care provider, practicing in Internal Medicine in Riverdale, Georgia. Dr. Okoro is rated as an Advanced provider by MediFind in the treatment of Cyclic Vomiting Syndrome. His top areas of expertise are Male Genital Sores, Familial Hypertension, Glucocorticoid-Remediable Aldosteronism, and Hypertension. Dr. Okoro is currently accepting new patients.