Mark Byron Jennings, MDOncology in Tulsa, OK

Mark B. Jennings, MD, is a board-certified, experienced hematologist at Ascension St. John in Tulsa, Oklahoma. Dr. Jennings diagnoses and treats blood diseases and blood cancer. Every appointment with Dr. Jennings starts with a conversation. He takes the time to answer all your questions - big and small.

Dr. Jennings has a clinical interest in leukemia, lymphoma, myeloma, hemophilia, sickle cell disease, anemia and blood clotting disorders. With our multispecialty approach to care, he works with a team of cancer specialists to deliver comprehensive, compassionate care.

Dr. Jennings is a native Tulsan who graduated from Jenks High School and received a bachelor's degree in history from the University of Oklahoma. He completed medical school at the University of Oklahoma College of Medicine, followed by residency training in internal medicine at the University of Texas Southwestern Medical Center in Dallas, Texas. Dr. Jennings then completed a fellowship in hematology and medical oncology at the University of Southern California in Los Angeles, California.