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Chief Medical Officer

Cindy B. Ivanhoe, MD

Dr. Ivanhoe is board certified in Physical Medicine and Rehabilitation and in Brain Injury Medicine.  She is a Professor in the Department of Physical Medicine and Rehabilitation at Baylor College of Medicine and Adjunct Faculty at the University of Texas-­Houston department of Physical Medicine and Rehabilitation.  Dr. Ivanhoe has served as Chief Medical Officer of Mentis Neuro Health since before our doors opened.  She remains an admitting physician to the Brain Injury and Stroke program at TIRR Memorial Hermann, a program she directed from1996­‐2006.  She has taught premedical students, medical students, residents, fellows and observers from the US and abroad.  She has published in many textbooks and articles and been an invited speaker in venues ranging from the Pro Football Hall of Fame to the southern hemisphere.  Dr. Ivanhoe’s clinical and research interests include medical complications of brain injury, spasticity and movement disorders, the continuum of care for neurologic rehabilitation and the impact of rehabilitation on quality of life.

Dr. Ivanhoe serves on the Board of Directors of the International Neurotoxin Association (INA), their educational committee and the medical advisory board of the Houston Area Parkinson’s Society(HAPS).  She currently serves on the Advisory Council of “REEL ABILITIES,” part of the largest film festival dedicated to promoting inclusion and celebrating the lives of people with disabilities.  She has served on numerous task forces and committees of the American Academy of Physical Medicine and Rehabilitation (AAPMR), including Spasticity, Mild Traumatic Brain Injury, and preparation of Brain Injury Medicine board review study materials.  She is currently on the Quality Practice, Policy and Research (QPPR) committee of the Academy.

Dr. Ivanhoe is a member of speakers’ bureaus for companies involved with medications and devices used in the treatment of spasticity and other movement disorders.  She has received awards from the Brain Injury Association, Baylor College of Medicine and the American Congress of Rehabilitation Medicine.  Dr. Ivanhoe has listed among U.S. News and World Report Top Doctors and among the Best Doctors in America since 2007.

Medical Director El Paso

Zoraya M. Parrilla, MD

Bio Coming Soon

Medical Director Houston

Natasha E. Rose, MD

Dr. Rose is a board certified Physical Medicine and Rehabilitation (PM&R) physician. She received her undergraduate and medical degrees from the University of Michigan Medical School and completed residency training at Baylor College of Medicine/University of Texas Health Science Center-Houston Physical Medicine and Rehabilitation Alliance. She also completed fellowship training in brain injury and stroke rehabilitation at Baylor College of Medicine.

Dr. Rose has been active in participating in all levels of neurologic and general rehabilitation including acute care consultations (Memorial Hermann Northwest Hospital, Memorial Hermann Hospital - The Medical Center and Memorial Hermann Rehabilitation Hospital Katy), acute inpatient rehabilitation at Memorial Hermann TIRR Hospital, and as acting medical director of acquired brain injury rehabilitation at Mentis Neuro Health in Houston. She has practiced in the outpatient setting, where she specializes in the management of chronically injured patients as well as in treating spasticity with botulinum toxin and intrathecal baclofen among other therapies. She is now serving as medical director of the acute inpatient rehabilitation unit at Memorial Hermann Northwest Hospital.

Medical Director San Antonio

Alex C. Willingham, MD

Dr. Willingham is a board certified Physical Medicine and Rehabilitation (PM&R) physician. He received his undergraduate degree from Texas Tech University and his medical degree from Autonomous University of Guadalajara, School of Medicine Guadalajara, Mexico where he received the highest academic achievement honors. He completed his residency at New York University Medical Center, becoming the chief resident at Bellevue Hospital Center and the Rusk Institute of Rehabilitation Medicine. He is a member of many professional organizations including the American Academy of Physical Medicine & Rehabilitation, Association of Academic Physiatrists, Bexar County Medical Society, Texas Medical Association as well as the International Academy of Life Care Planners.

 Dr. Willingham is a clinical assistant professor at the University of Texas Health Science Center-San Antonio as well as a member of the advanced curriculum faculty at the University of Florida’s Department of Rehabilitation Counseling. He has presented many scientific papers on topics such as intrathecal baclofen therapy, life care planning and hemiplegia. Further, he has presented numerous speeches on the subject of traumatic brain injury, stroke, spinal cord injury and life care planning.

Clinically, Dr. Willingham serves patients at the acute rehabilitation level as the medical director for Warm Springs Rehabilitation Hospital-San Antonio. As medical director for Mentis Neuro Health San Antonio, he helps patients to transition from acute rehabilitation services into a continuum of care including an acquired brain injury rehabilitation program and community re-entry.

Medical Director Ohio

Anthony A. Hayek, DO

Dr. Hayek is the medical director for Mentis Ohio. Additionally, his current appointments include director of brain injury services at Edwin Shaw Rehabilitation Institute and president of Summit Rehabilitation Medicine, Inc. He also serves as clinical assistant professor of Internal Medicine at Northeastern Ohio Universities College of Medicine.

 After completing his degree as a doctor of osteopathy from Ohio University College of Osteopathic Medicine in 1993, Dr. Hayek completed his physical medicine and rehabilitation residency at St. Francis Medical Center in 1997. During his time at St. Francis Medical Center, he served as chief resident and received the Ronald L. Zimmerman, MD Caduceus Award.

Dr. Hayek currently holds a certification with the American Osteopathic Board of Physical Medicine and Rehabilitation. With this certification, he focuses on the care of patients with acquired brain injuries along with coordinating the spectrum of clinical and community resources available in the area in his rehabilitation practice. His oversight at Mentis Ohio's community re-entry program is a complimentary extension of his focus on meeting the needs of individuals with acquired brain injury in his community.












Mentis provides the highest level of neuro rehabilitation to people who have sustained an acquired brain injury or who have conditions that restrict mobility, social interaction, communication, employability and re-entry into their homes and communities.

Phone:  1.855.921.7978

Mentis Austin: 100976, 000573, 000575
Mentis Houston: 103275
Mentis Neuro San Antonio: 105124
Mentis El Paso: 106227