Dr. Nimeh has provided exceptional care to cancer patients in Southwest Oklahoma for over 25 years. He received his medical degree from the American University of Beirut, Lebanon, completed a residency in Internal Medicine at the Michigan State University, and completed a fellowship in Hematology and Oncology at The Simpson Memorial Institute, The University of Michigan Medical Center. Dr. Nimeh is board certified in Internal Medicine, Hematology, and Oncology.

Dr. Ziegler received his medical degree from the Medical College of Pennsylvania, Philadelphia, PA, completed an intership/residency in Radiation Oncology at New York University Bellevue Medical Center in New York, and completed fellowships in Radiation Medicine and Radiation Oncology. Dr. Ziegler is board certified by the American Board of Radiology.

Dr. Robin-Hanna received her medical degree from Ein Shams University in Cairo, Egypt, completed a residency in Internal Medicine at the Cabrini Medical Center, Mount Sinai School of Medicine in New York City where she also completed a fellowship in Hematology and Oncology. Dr. Robin-Hanna is board certified in Internal Medicine, Hematology, and Oncology.

Dr. Mackey has over 30 years of experience. Dr. Mackey received her medical degree from the Medical College of Pennsylvania where she also completed an internship in internal medicine/pediatrics. Dr. Mackey then went on to complete a residency in radiation oncology at Penrose Cancer Hospital, Colorado Springs, Colorado. Dr. Mackey is specialized in brachytherapy, 3-D conformal radiation therapy, stereotactic radiosurgery, accelerated partial breast irradiation, IMRT and IGRT. Dr. Mackey is also Board Certified in Therapeutic Radiology.