Dr. John | Santa Ana, CA – Syrentis Clinical Research
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Dr. Duffy currently maintains a private practice in Santa Ana, California where he specializes in the evaluation, diagnosis and treatment of geriatric patients suffering from depression, psychosis and all stages of Alzheimer’s disease as well as other forms of dementia. He currently serves as Medical Director for the Senior Mental Health Unit of Chapman Medical Center, and has served as the Associate Medical Director of the NeuroPsychiatric Management Group which managed a 24 bed Geriatric Psychiatry inpatient unit at Western Medical Center Santa Ana. Additionally, he has served as Medical Director at numerous secured dementia facilities and has chaired the Psychotropic Utilization Review Committees for several long term care facilities in Orange County, CA. In addition to holding office hours and rounding on patients at Chapman Medical Center, WMCSA and Coastal Community Hospital, Dr. Duffy regularly visits his patients who reside in local skilled nursing home, board and care, assisted living and secured dementia facilities.

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As the owner and President of Syrentis Clinical Research, Dr. Duffy leads our team of highly qualified professionals. He is dedicated to conducting research in an ethical, compassionate, and friendly environment that satisfies the needs of both sponsors and subjects.

Visit our center in Santa Ana, CA to get to know Dr. Duffy and our professional staff.

Call 714-542-3008.

Dr. Duffy has over 20 years of experience in health care, and has held positions at the following institutions:


- Research Across America, Santa Ana, CA

- Apex Research Institute, Santa Ana, CA

- Institute of Pharmacological Research

- Western Medical Center, Santa Ana, CA

Over 20 years of experience





Medical Director at Chapman Medical

Center Senior Mental Health Unit

Medical Director at Silverado Senior Living Tustin

Associate Medical Director at the

NeuroPsychiatric Management Group

Medical Director at Alta Care Center's

Alzheimer's Unit


A proven leader

Dr. Duffy serves as Principal Investigator at Syrentis Clinical Research and leads clinical trials that involve many Central Nervous System (CNS) disorders. Past trials have included Alzheimer's Dementia, major depressive disorder, anxiety disorder, bipolar disorder, insomnia, fibromyalgia and more.


Dr. Duffy is dedicated to the clinical evaluation and treatment of geriatric patients living with Dementia, and has served as Principal or Sub-Investigator on over 50 clinical research trials with an emphasis on evaluating treatment options for patients living with Alzheimer's Dementia.


John Gregory Duffy, MD


If you are interested in joining a clinical trial click here

A dedicated clinician

A compassionate and experienced principal investigator












Dr. Duffy has held many leadership positions in the medical profession, including: