Karen A. Fleiss, PsyD

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About Me

I have always been enchanted by children and their ability to simply “be” in the world, just as they are. I find them to be extraordinarily resilient, even under the most serious of circumstances.

I wanted to further understand child development, parental roles, nature versus nurture, and the influence of the school environment on a child’s growth. More broadly, I wanted to know more about how childhood disorders emerge. For these reasons, I decided to leave my first career in a corporate job to pursue child clinical psychology, a profession I found to be satisfying and fulfilling.

I am the clinical director of NYU Langone’s Child Study Center—Long Island, where my team and I provide families with parent–child interaction therapy, school consultation, individual and family therapy, social skills training groups, medications for a wide variety of clinical disorders, and neuropsychological testing.

For the past 17 years, I have also been the director of the Child Study Center’s Summer Program for Kids, an evidence-based day camp for children 7 to 11 years old who have been diagnosed with attention deficit hyperactivity disorder and behavior disorders.

I was also the site coordinator of a landmark multisite clinical trial—the Multimodal Treatment of Attention Deficit Hyperactivity Disorder (MTA) study—designed to determine the most effective treatments for children with attention deficit hyperactivity disorder.

Treatment must include the parents if we are to best help the child. If a child is struggling in school, the teacher’s input and involvement are also important to successful treatment. The key is regular discussions among all professionals caring for the child, allowing us to monitor progress and symptoms from various angles.

Conditions and Treatments

attention deficit hyperactivity disorder, oppositional defiant disorder, disruptive behavior disorder, parent training, behavior disorder, behavior therapy


  • Clinical Associate Professor, Department of Child and Adolescent Psychiatry
  • Clinical Associate Professor, Department of Psychiatry
  • Clinical Director, Child Study Center Long Island Practice
Education and Training
  • PsyD from Yeshiva University, 1989

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Locations and Appointments

2 Insurance Plans Accepted
  • United Health Care Options PPO (NYU Langone Health Employees)
  • United Healthcare Choice (NYU Langone Health Employees)
*Insurance listed above may not be accepted at all office locations. Please confirm prior to each visit. The information presented here may not be complete or may have been changed.
NYU Child Study Center

1991 Marcus Avenue, Suite 104
New Hyde Park, NY 11042

NYU Child Study Center

1 Park Avenue, 7th Floor
New York, NY 10016

Research Academic Contact

Academic office

1981 Marcus Avenue

Lake Success, NY 11042



Research Interests Timeline

These focus areas and their associated publications are derived from PubMed and the MeSH term library.
represents one publication


Read All Publications (4)