In-House Expert Clinicians

Unlike online marketplaces that use hourly contract workers, our expert licensed psychologists are Polygon employees with full benefits and equity compensation. We believe this is what top clinicians deserve and leads to a best-in-class service for clients.

Meet Some of Our Team

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 testing. 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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