Kaleigh Herron, NP, is certified by The American Association of Nurse Practitioners. She specializes in Hematology Oncology, treating polycythemia, iron deficiency, leukopenia, leukocytosis, thrombocytopenia, thrombocytosis, normocytic anemia, lymphocytosis, megaloblastosis, thalassemia, and pernicious anemia. In her spare time, Kaleigh enjoys working out, playing cozy, video games, baking, dancing, and trying new restaurants. Kaleigh welcomes new patients and accepts most major insurance... Read More about Kaleigh Herron, NP

Vida Umstead, NP, earned her Masters of Science in Nursing, Family Nurse Practitioner degree from the University of Florida. She has been board certified by the ANCC since 2001 and CDCES certified since 2021. Vida brings over 20 years of experience and has a strong passion for diabetic care and education. She strives to empower individuals and their families in... Read More about Vida Umstead, NP

Dr. Michele T. Perez is a board-certified specialist in Physical Medicine and Rehabilitation with expertise in non-operative spine care, musculoskeletal medicine, and electrodiagnostic medicine. She is dedicated to helping patients manage pain and restore function through comprehensive, personalized treatment plans. Dr. Perez completed her residency at Emory University and earned her medical degree from Louisiana State University Medical Center. As... Read More about Dr. Michele Perez

Dr. Widener is an orthopedic surgeon at Resurgens Orthopaedics, located at the Canton office. He specializes in general orthopedics, hip, knee, shoulder, and sports medicine. Dr. Widener earned his medical degree from the Medical College of Georgia in Augusta and completed his residency at Madigan Army Medical Center in Fort Lewis, WA. His areas of expertise include trauma and fracture... Read More about Dr. Doug Widener

Dr. Ryan C. Chen is a board-certified orthopedic surgeon specializing in knee, shoulder, sports medicine and joint replacement. He earned his medical degree from Emory University School of Medicine and completed his orthopedic surgery residency at Washington University School of Medicine. Dr. Chen further specialized with a sports medicine fellowship at the Cincinnati Sports Medicine & Orthopaedic Center. He practices... Read More about Dr. Ryan Chen

Dr. Glenn J. Jonas, M.D., is an orthopedic surgeon specializing in hand, wrist, elbow, and shoulder surgery. He practices at Resurgens Orthopaedics’ Canton, Kennesaw, and Woodstock locations in Georgia. Dr. Jonas earned his medical degree from New York University School of Medicine and completed his residency at New York University. He further specialized with a fellowship in Hand and Microsurgery... Read More about Dr. Glenn Jonas

Dr. Mardhani offers comprehensive care for everyone including women and children. She also offers minor office procedures such as pap smears, joint injections, wart cryotherapy, basic sutures and skin tag removals. Dr. Mardhani believes in stressing the importance of preventative medicine and patient education to improve the health and wellness of all of her patients. Dr. Mardhani has a fundamental... Read More about Ambreen Mardhani, MD

Dr. Hefner earned his medical degree and completed his internal medicine residency at the University of Alabama, School of Medicine in Birmingham. Board certified in internal medicine and pediatrics, Dr. Hefner is a fellow of the American Academy of Pediatrics. Prior to joining Piedmont Physicians, Dr. Hefner was in practice in Woodstock, Georgia. He also was a member of the... Read More about Jason Hefner, MD

Dr. Leyla Makue earned her Bachelor of Science in Biomedical Sciences from the University of Central Florida and received her Doctor of Medicine (MD) degree from the University of Cincinnati. She completed her residency in Internal Medicine at Emory University and went on to serve for one year as a hospitalist with Piedmont Healthcare, caring for patients in the Rockdale... Read More about Leyla Fowe Makue, MD

Dr. Karthik Ponnusamy, M.D., M.S.E., is a board-certified orthopaedic surgeon at Pinnacle Orthopaedics, specializing in hip and knee replacements, arthroscopy, total and partial knee replacements, total hip replacements (including the direct anterior approach), robotic knee replacement, arthroplasty, and general orthopaedics. He practices at Pinnacle Orthopaedics' Canton and Woodstock offices. Dr. Ponnusamy earned his medical degree from Stanford University, completed his... Read More about Karthik Ponnusamy, MD MSE

Gary C. Chan, D.O., Ph.D., earned his medical degree from Kansas City University of Medicine and Biosciences, completed his Internal Medicine Residency at Brookwood Baptist Health and Cardiology Fellowship at University of Arizona in Tucson. He is board certified in Internal Medicine. In addition, Dr. Chan has 13 years of molecular cardiovascular research experience, and completed a Post-doctoral Research Fellowship... Read More about Gary Chan, DO

Michael Hoosien, MD MSc, received his medical degree from the University of Miami Miller School of Medicine. He continued his training with an internal medicine residency at the University of Miami and Jackson Memorial Hospital, a post-doctoral fellowship in molecular cardiology at the Miller School of Medicine, followed by fellowships in cardiovascular medicine and cardiac electrophysiology at the Cleveland Clinic... Read More about Michael Hoosien, MD

Mridula Vinjamuri, M.D. comes to Piedmont Oncology with over 21 years of clinical experience. She completed her fellowship in Hematology and Oncology at West Virginia University in Morgantown, WV. Her Internal Medicine residency was at Michigan State university, Covenant Hospital in Saginaw, Michigan and her Surgical Internship was at Cornell University /North Shore University Hospital in Manhasset, New York. Dr.... Read More about Mridula Vinjamuri, MD