Clinic & Patients at Banner Sun Health Research Institute  

Our Doctors


Marwan Sabbagh, MD

Marwan Sabbagh, MD, board-certified neurologist, hopes to work himself out of a job. As the medical director of Banner Sun Health Research Institute, Dr. Sabbagh has dedicated his entire career to finding a cure for Alzheimer’s and other age-related neurodegenerative diseases.

Dr. Sabbagh is a leading investigator for many prominent national Alzheimer’s prevention and treatment trials, including Alzheimer vaccine studies.

He is associate editor for the Journal of Alzheimer's disease and Clinical Neurology News, has authored and co-authored more than 100 medical and scientific articles on Alzheimer’s research.  Dr. Sabbagh has authored two books, "Palliative Care for Advanced Alzheimer’s & Dementia'' and "The Alzheimer’s Answer, whose forward was written by former Justice Sandra Day O’Connor.

In addition to his clinical work and private practice in Sun City, Dr. Sabbagh is associate director of the Arizona Alzheimer’s Disease Core Center, a clinical instructor in the Banner/St. Joseph’s Geriatric Fellowship Program, and a visiting scientist in the Department of Neurology at Mayo Clinic Scottsdale.

Dr. Sabbagh earned his undergraduate degree from the University of California Berkeley and his medical degree from the University of Arizona in Tucson.

Holly Shill, MD

Holly Shill, MD, is head of Banner Sun Health Research Institute’s Thomas H. Christopher Center for Parkinson’s Research.

Dr. Shill received her bachelor’s degree in electrical engineering and her medical degree from the University of Arizona.

As a board-certified neurologist, Dr. Shill’s goal is not only to treat people with neurological movement disorders but to find cures. Her current research includes developing neuroprotective drugs and other strategies to prevent and/or slow the progression of Parkinson’s disease.

Dr. Shill is optimistic research eventually will unlock Parkinson’s disease’s mysteries.  She devotes 60 percent of her time to treating patients with Parkinson’s disease-related movement disorders and 40 percent to research.  Her research interests also include developing models to better predict who gets Parkinson’s disease and Parkinson’s disease related dementia.

Sara Dhanani, MD

Sara Dhanani, MD is a movement disorders neurologist who works with patients with Parkinson’s, tremors and other movement conditions.

Before coming to Banner Sun Health Research Institute, Dr. Dhanani served a movement disorders fellowship at Muhammad Ali Parkinson’s Center at Barrow Neurological Clinic in Phoenix. She earned her medical degree from Dow Medical College in Pakistan in 2004. Dhanani served her residency at the University of Illinois College of Medicine and is certified by the Arizona Medical Board.

Dhanani is the author of numerous peer papers and publications and serves on the American Academy of Neurology and the Movement Disorders Society.

clinical trials

To schedule an appointment at The Cleo Roberts Alzheimer's and Movement Disorder Clinic, call 623-832-6530.

Banner Sun Health Research Institute
10515 W. Santa Fe Drive
Sun City, AZ 85351
(623) 832-6500
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