Expert Clinicians
Our clinicians have attended some of the leading universities and training programs in the country. They integrate their knowledge and experience with compassionate care for every client.
Meet Our Expert Clinicians
Dr. Sharon Witkin, PhD
Chief Clinical Officer
Before leading Polygon’s clinical practice, Sharon founded a leading Bay Area group practice and has extensive experience as a private practitioner. Sharon has also held roles as an assistant clinical professor at UC Berkeley, a researcher at MIT, and served on the clinical leadership team at the Stanford-affiliated Children’s Health Council. Sharon received her PhD from the California School of Professional Psychology and completed her postdoctoral training at Stanford University.
Dr. Melony Cohen, PsyD
Clinical Supervisor
Before joining Polygon, Melony worked in several Los Angeles-area practices specializing in neuropsychological and psychoeducational evaluations. Melony initially studied at UCLA and received her PsyD in clinical psychology from the California School of Professional Psychology.
Dr. Bernice Joo, PhD
Clinical Supervisor
Bernice received her PhD in clinical psychology from the University of Virginia and completed her training at Children’s Hospital Los Angeles. Before Polygon, she ran a Bay Area-based private practice specializing in test and support for neurodevelopmental disabilities.
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