M.D.
Medical Oncologist and Hematologist
George B. Semeniuk, III, M.D., was inspired to pursue oncology during medical school, following the loss of a young family member to brain cancer. With over 20 years of experience in cancer care, he remains committed to developing customized treatment strategies that reflect the unique needs and circumstances of every patient and their loved ones. He is a board-certified medical oncologist and hematologist and a clinical professor in the Department of Medical Oncology and Therapeutics Research at City of Hope® Cancer Center Duarte.
Dr. Semeniuk is known for his compassionate and attentive approach, as well as his collaborative philosophy of care, working with patients and their care team to create treatment plans that align with their personal goals and values. His clinical focus includes head and neck cancers, lung cancer and skin cancer. In the research lab, Dr. Semeniuk supports research efforts at City of Hope that are focused on developing and testing new cancer therapies. With training in integrative oncology, he blends evidence-based complementary approaches with conventional treatments to support each patient physically, emotionally and spiritually.
Dr. Semeniuk earned his medical degree from St. George’s University in New York. He completed his internal medicine internship and residency at the University of California, San Francisco, where he also served as chief resident, as well as fellowships in both hematology/oncology at the University of Texas Southwestern Medical Center in Dallas and integrative medicine at the University of Arizona in Tucson. Prior to joining City of Hope, Dr. Semeniuk ran a private practice and held positions at Hoag Memorial Hospital Presbyterian Hospital in Newport Beach, California, and the Keck School of Medicine at the University of Southern California in Los Angeles.
Outside of the clinic, Dr. Semeniuk enjoys spending time with his family, playing golf and tennis, hiking, cooking and seeking out new adventures.