Dr. John L. Gwin

Dr. Jennings is Medical Director of Pancreatic and Hepatobiliary Cancer at CHI Memorial Rees Skillem Cancer Institute, and a surgeon with CHI Memorial Surgical Oncology Associates. He is a a board-certified surgeon, specializing in the diagnosis and surgical management of complex malignancies, including pancreatic cancer, colon and gastric cancer, rectal cancer, neuroendocrine tumor, melanoma and other skin cancers, as well as benign diseases of the gallbladder, colon and stomach, such as diverticulitis and ulcer disease, and repair of hernias. He has over 30 years experience in these areas.He strives to use the surgical gifts and experience God has provided him to provide healing and comfort to patients, while giving the glory to Him. Dr. Jennings is rated as a Distinguished provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Cholecystitis, Gallbladder Disease, Familial Colorectal Cancer, Hernia Surgery, and Small Bowel Resection.

Justin Wilkes, MD, a Board-Certified Complex General Surgery Oncologist with CHI Memorial Surgical Oncology Associates, provides advanced surgical care - to diagnose, stage and effectively treat cancer, and manage cancer-related symptoms. Dr. Wilkes utilizes advanced robotic-assisted technology and minimally invasive surgical techniques to help patients recover faster with less pain and minimal scarring. Dr. Wilkes specializes in: Adrenal gland surgery. Gastrointestinal oncology including gastric, pancreatic, colon, hepatobiliary, rectal, small intestine, and neuroendocrine tumors. Soft tissue sarcomas including retroperitoneal, sarcoma, extremity sarcomas, GIST. Skin cancers including melanoma, squamous cell, basal cell and merkel cell. General surgery procedures for gallbladder, appendix, and benign colorectal conditions. Dr. Wilkes is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Pancreatic Cancer, Familial Pancreatic Cancer, Cholecystitis, Small Bowel Resection, and Gastrostomy.

Dr. Andrew Harper is a highly experienced and dedicated General Surgeon providingcomprehensive surgical care to his community. A long-standing medical professional, he iscommitted to prioritizing patient care and fostering meaningful interactions with those heserves.Dr. Harper brings decades of expertise to his practice, specializing in both minimallyinvasive and open surgical procedures. His extensive surgical services include treatment forgallbladder diseases, gastrointestinal diseases, appendicitis, and colon diseases. He alsoexpertly manages breast disorders, thyroid and parathyroid disorders, and all types ofhernias. Dr. Harper earned his medical degree from Emory University School of Medicine in1985, following his undergraduate studies at the Georgia Institute of Technology, where hegraduated with a Bachelor of Chemical Engineering in 1981. He completed his rigorousGeneral Surgery Residency at the Medical University of South Carolina in 1990.Prior to establishing his practice, Dr. Harper proudly served in the U.S. Army Reservefrom 1987 to 1996, including active duty during the Persian Gulf War from August 1990 toMay 1991. He has been a fixture in the medical community at Rockdale Hospital inConyers, GA, serving patients there from 1990 to 2025. Dr. Harper's philosophy is simpleyet profound: patient care always comes first, driven by the most rewarding aspect of hiswork – the direct interactions he shares with his patients.Outside of his professional commitments, Dr. Harper cherishes spending quality timewith his family, especially his grandchildren. He is also passionate about caring for his petsand other animals on his property, finds solace and satisfaction working on his tractor,enjoys riding motorcycles, and is an avid supporter of Georgia Tech football. Dr. Harper is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Gallbladder Disease, Gallstones, Choledocholithiasis, Vagotomy, and Hernia Surgery.