CenExel CNR

For over 20 years, CenExel CNR has served our community and the clinical research industry in California, specializing in neuroscience trials.

CNR Leadership


Thomas M. Shiovitz, M.D.

Dr. Shiovitz has over 25 years of clinical research experience, including 7 years as Medical Director of California Clinical Trials in Beverly Hills and International Clinical Trials in London. He has been a Principal Investigator on scores of successful CNS clinical trials and an investigator on over 300 studies in indications such as Alzheimer’s Disease, Schizophrenia, Generalized Anxiety Disorder, Social Phobia, Panic Disorder, Major Depression, Insomnia and Migraine. Dr. Shiovitz brings expertise in study design and a wealth of experience in clinical trial execution. He is Board Certified in Psychiatry (1989) and in Geriatric Psychiatry (1996, 2006) and an Assistant Clinical Professor of Psychiatry at UCLA. He is on the attending staff of Cedars-Sinai Medical Center and Sherman Oaks Hospital.


Maria I. Seliverstov, M.D.

Dr. Seliverstov is Board Certified in Psychiatry (2003) and Geriatric Psychiatry (2006). She has been a sub-investigator on multiple clinical trials in indications including Alzheimer’s Disease, Mild Cognitive Impairment, Insomnia, Generalized Anxiety Disorder, Panic Disorder, Migraine and Major Depression since completion of her Fellowship in Geriatric Psychiatry from UCLA in 2002. In addition, Dr. Seliverstov has experience performing numerous psychiatric rating scales.


Iman Parhami, M.D.

Dr. Iman Parhami is a Principal Investigator at CenExel CNR. With over two years at CenExel, he’s led pharmacological clinical trials for ADHD, depression, PTSD, and more. Currently an adjunct clinical assistant professor, he also sees outpatient clients at USC’s UCEDD in Los Angeles. In addition, Dr. Parhami co-founded a private intensive outpatient program, showcasing his commitment to comprehensive care.

Beyond trials, Dr. Parhami focuses on mood disorders, autism, and addictions. Formerly with LA’s Department of Mental Health, he treated severe mental illnesses. A recipient of national recognition awards, including from the American Academy of Children and Adolescents, he’s published extensively on addictive disorders.

Dr. Parhami is triple board-certified in Child Psychiatry, Adult Psychiatry, and Addiction Medicine, and completed his child and adolescent psychiatry training at Johns Hopkins. Furthering his expertise, Dr. Parhami completed postdoctoral research at UCLA and a clinical fellowship at the Psychoanalytic Center of Philadelphia.

Safety and quality are paramount

Our physicians have extensive background in clinical research and always prioritizing patient safety.




25+ years of clinical trial experience


Assisted by expertly-trained medical staff


CNR Clinical Research

4835 Van Nuys Blvd., Suite 104
Sherman Oaks, CA 91403


Monday: 9am – 5pm
Tuesday: 9am – 5pm
Wednesday: 9am – 5pm
Thursday: 9am – 5pm
Friday: 8am – 4pm
Saturday: Closed
Sunday: Closed

We’re a CenExel
Center of Excellence

Centers of Excellence provide unparalleled attention to detail to assure consistent and first-class quality in patient care. We have supported tens of thousands of studies, the variety and complexity of which have resulted in a great depth of experience for the principal investigators and research staff at each Center.

We deliver engagement, expertise, and results.


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