Sami Alasfar, M.D., M.P.H.

Jonathon J. Parker, M.D., Ph.D. is a neurosurgeon at Mayo Clinic in Phoenix, Arizona. Dr. Parker treats brain tumors, epilepsy, and movement disorders, including anesthesia dolorosa, brachial plexus avulsion pain, central pain syndrome, facial pain disorder, glioblastoma, glioma, hypothalamic hamartoma, dystonia, DYT1 dystonia, and essential tremor. He is an expert in asleep deep brain stimulation, awake brain surgery, brain mapping, brain tumor surgery, corpus callosotomy epilepsy monitoring, epilepsy surgery and intraoperative magnetic resonance imaging, with a special interest in eloquent region brain tumors, gliomas, and metastatic lesions and medication refractory epilepsy. Mayo Clinic in Phoenix/Scottsdale, Arizona ranks among the Best Hospitals for Neurology and Neurosurgery in the U.S. News & World Report “Best Hospitals” rankings.

William G. Rule, M.D., is a radiation oncologist at Mayo Clinic Comprehensive Cancer Center in Phoenix, Arizona. Dr. Rule treats colon cancer, esophageal cancer, stomach cancer, anal cancer, cholangiocarcinoma, pancreatic cancer, neuroendocrine tumors, liver cancer, leukemia, lymphoma and multiple myeloma. He is an expert in proton beam therapy, intraoperative radiation therapy, intensity-modulated radiation therapy, total skin electron beam therapy and stereotactic body radiotherapy. Dr. Rule focuses on the best treatment for your unique cancer while optimizing your quality of life. He speaks English and Spanish. Mayo Clinic is the #1 hospital in Arizona, according to the U.S. News & World Report, and the Cancer Center continually ranks among the top hospitals in the U.S. for Cancer. Mayo Clinic Comprehensive Cancer Center is a National Cancer Institute (NCI)-designated comprehensive cancer center.

Donald W. Northfelt, M.D., is an oncologist at Mayo Clinic Comprehensive Cancer Center in Phoenix, Arizona. Dr. Northfelt treats conditions and cancers, including breast cancer, colon cancer, lymphoma, rectal cancer, rhabdomyosarcoma, sarcoma and congenital blood clotting disorder. He is interested in improving survival by reducing relapse risk and more effectively controlling advanced cancer. Mayo Clinic is the #1 hospital in Arizona, according to the U.S. News & World Report, and the Cancer Center continually ranks among the top hospitals in the U.S. for Cancer. Mayo Clinic Comprehensive Cancer Center is a National Cancer Institute (NCI)-designated comprehensive cancer center.