Our Staff

Stuart A. Ibel, PhD BCBA-D, Program Director

Dr. Stuart Ibel is Program Director at Challenge. He received his PhD from SUNY Stony Brook. Dr. Ibel is a Board Certified Behavior Analyst at the Doctoral Level, a NYS Licensed Psychologist and a NYS Certified School Psychologist. He has over 20 years of experience diagnosing and treating young children who have ASD and other Developmental Disorders.

Laura Leonard, MS, BCBA, LBA ABA Program Supervisor

Laura Leonard, MS, BCBA, LBA is the ABA Director at Challenge’s ABA Program for children with Autism and related developmental disorders. Ms. Leonard received her Masters degree in School Psychology from St. John’s University. She is a Board Certified Behavior Analyst, a NYS Licensed Behavior Analyst, a NYS Certified School Psychologist and A Special Education Teacher. She has over 20 years of experience working with children diagnosed with ASD and other Developmental Disorders using a variety of behavioral and educational interventions.

Rosemarie Tsigos, MS Ed BCBA, Queens & Far Rockaway ABA Coordinator

Rosemarie Tsigos is the ABA Coordinator for Challenge in Queens. Ms. Tsigos received her Masters Degree in Special Education from LIU, CW Post College. She is a Board Certified Behavior Analyst and a Special Education Teacher. She has over 20 years experience working with children diagnosed with ASD. She has conducted parent and professional workshops and trainings related to ASD for parents and professionals. Ms. Tsigos is responsible for staff recruitment, assignment and supervision in Queens.

Raizy Klein-Perlstein, MS Ed, BCBA, Staten Island ABA Coordinator

Raizy Klein-Perlstein, MS Ed, BCBA, is the ABA Program Coordinator for Challenge in Staten Island. Ms. Perlstein received her MS from Adelphi University. She is a Board Certified Behavior Analyst and a Special Education Teacher. She has over 20 years experience working with children diagnosed with ASD. She has conducted parent and professional workshops and trainings related to ASD for parents and professionals. Ms. Perlstein is responsible for staff recruitment, assignment and supervision in Staten Island.

Clinical, Behavioral and Educational Approaches Utilized at Challenge

All ABA Supervisory Staff have extensive training in a variety of clinical, behavioral and educational approaches that have been shown to be effective for treating children diagnosed with Autism Spectrum Disorders. These include: Applied Behavior Analysis, Behavior Modification, Curriculum Development, Discrete Trial Teaching, Incidental Teaching, Strategies for Skill Generalization, Developing Positive Behavioral Supports, Functional Analysis of Problem Behavior, VB (the teaching of verbal behavior based on Skinner's analysis of language), Functional Communication Training, the Picture Exchange Communication System, the use of Picture and Photo Activity Schedules, and Inclusions.