Methodist University Hospital Methodist University Hospital

About the Physicians and Staff

Allen K. Sills, Jr., MD

Allen K. Sills, Jr., MD

Allen K. Sills, Jr., M.D., Neuroscience Institute Medical Director
A nationally recognized neurosurgeon with the Semmes-Murphey Neurologic & Spine Institute, Dr. Sills is an Associate Professor in the Department of Neurosurgery at the University of Tennessee Health Science Center in Memphis. Dr. Sills has authored more than 60 publications regarding his research and has participated in numerous clinical trials. He obtained his medical degree from Johns Hopkins University, where he completed a fellowship in brain tumors. Dr. Sills is certified by the American Board of Neurological Surgery, specializing in brain tumors, cerebrovascular disease, Gamma Knife radiosurgery and sports neurosurgery.

Luis Albero Vargas-Ortiz, MD

Madison Michael, MD

Dr. Michael, also of the Semmes-Murphey Neurologic & Spine Institute, graduated from the University of Tennessee Medical School. Upon completion of internship in general surgery, he began his neurosurgical residency at the University of Tennessee in Memphis. Dr. Michael is the Director of the Skull-Base Division for the Neuroscience Institute. Along with his clinical duties, he was involved in multiple research activities and published articles in respected medical journals. He served as Chief Resident of the program during his final year. Under the influence of Dr. Jon Robertson, he developed a significant interest in skull base neurosurgery. Following graduation, he completed a 12-month international fellowship in both skull base neurosurgery and complex spine surgery in Bristol, England. His special areas of interest are skull base neurosurgery, pituitary surgery, acoustic neuromas, brain tumor surgery and complex spine surgery. He is a member of the American Academy of Neurological Surgery, North American Skull Base Society, the American Academy of Neurological Surgery and other prestigious societies.


Wayne Hamm

Wayne Hamm

Certified Registered Nurse Anesthetist

Another narrator and key member of this highly-skilled team is Wayne Hamm, a Certified Registered Nurse Anesthetist. Hamm is with the Medical Anesthesia Group and has more than 30 years of experience in neuroanesthesia and neuro-otological procedures. He graduated from the University of Tennessee with a Master’s Degree in Nursing with an emphasis in Medical-Surgical Nursing. He received his diploma in Anesthesiology from Duke University Medical Center, where he was awarded the Sarah Dent Award for Outstanding Achievement.

Hamm has contributed to several books and has been published in many prestigious publications, such as Anesthesiology Review, the American Journal of Otology, the Journal of Neuroscience Nursing and Neuro-Oncology. Hamm is a member of the American Association of Nurse Anesthetists and licensed as a Registered Nurse in Tennessee.



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