About Us

The West Essex Psychology Center has been providing expert evaluation and treatment services for over 25 years. We are a group of highly trained and experienced psychologists committed to meeting the needs of our clients.

Our psychologist are licensed in New York and New Jersey.

Our Doctors

Barry Katz, Ph.D.

Dr. Katz has over 25 years of extensive experience working with the court, DCPP, Office of the Law Guardian, Public Defender’s Office, private attorneys, U.S. Attorney’s Office, insurance companies and other agencies...

Mark Singer, Ed.D.

Dr. Mark Singer is a retired Police Sergeant from the West Orange Police Department. Dr. Singer has been a licensed psychologist in New Jersey since 1999 and performs evaluations and provides treatment in several areas, including child abuse/neglect cases, child custody cases, and parental capacity cases.

Elizabeth Stilwell, Psy.D.

Dr. Stilwell is a licensed psychologist in New York and New Jersey. She obtained her Psy.D. in Clinical Psychology with a concentration in Forensic Psychology from William James College in 2015 and her M.A. in Clinical Psychology from Columbia University in 2010.

Thai Alonso, Ph.D.

Dr. Alonso is a bilingual licensed Clinical Psychologist in New York and New Jersey. She is a fluent Spanish-speaker and specializes in clinical and forensic evaluations of children, adolescents, and adults. Dr. Alonso conducts cognitive, mental health, risk, parenting capacity/fitness, termination of parental rights, guardianship, and custody evaluations. Dr. Alonso testifies as an expert witness in New Jersey Superior Court and provides consultation to the Department of Child Protection and Permanency, the Office of the Law Guardian, the Office of the Public Defender, and private attorneys.
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