Penelope Jackson, MD specializes in internal and pediatric medicine at Lake Granbury Internal Medicine & Pediatrics in Granbury, Texas. Dr. Jackson focuses on treating the whole person, rather than just the symptoms and provides comprehensive diagnostics and treatment of acute and chronic conditions, like allergies and heart disease. She is accredited by both the American Board of Internal Medicine and the American Board of Pediatrics and affiliates with Lake Granbury Medical Center.In addition to traditional medical services, Dr. Jackson is also highly skilled and knowledgeable about overall wellness and weight loss. She also treats hormone imbalances, using hormone replacement therapy. Dr.