UPDATED: January 27, 2021

BehaviorSpan was founded in Denver in 2015 by Dr. J. James Tomash (Board Certified Behavior Analyst- Doctorate-level) and his wife Nicole Da Lima Leitao (Board Certified Behavior Analyst). Between them, they have over 18 years of experience working with a variety of children and adults with different Developmental Disabilities. Over time, they developed a model based on their results - fine tuning and sometimes radically changing their approach to pursue the best possible outcomes they could get for their clients.
Today they have a very specific and fine-tuned system that gets optimal results by working with young children that have just been diagnosed- providing intensive, center-based, Early Learning ABA services. On average, it takes about one year in their program for a child to ‘graduate’- ready to go to school or preschool. While these results aren’t certain for all children, the critical step is to help them learn as many foundational skills as quickly as possible to set them up for a full and happy life. The program is based on 4 principles: Early Intervention; Individualized, results-driven treatment; Intensive treatment; and center-based services.

  • Languages:
  • English
  • Hindi
  • Spanish
  • Insurances Accepted:
  • No Cost
  • Medicaid
  • Private Insurance


9725 E Hampden Ave
STE 101
Denver, CO 80231
United States






Christine Duong

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