About BehaviorSpan


BehaviorSpan was founded by J.J. Tomash, BCBA-D in Denver in 2015. Starting as a small company, providing ABA therapy to just a few clients, BehaviorSpan now has ABA centers in Aurora and Wheat Ridge.

As our company has grown, our goal has stayed the same: to provide the most effective behavior analytic therapy for children on the autism spectrum possible. Our centers are joyful, fun, respectful, caring, and playful environments. We have carefully created environments to capture opportunities for children to learn and grow, ensuring that the skills they learn help them in all environments of their life: current and future. This is the foundation that allows us to provide highly effective ABA therapy- which can most efficiently address the needs of children with autism.

The most important tool we have is our team. We love what we do. We respect and care for our clients, their families, and each other. We find joy in every accomplishment as we work and play alongside your child.

Along the same lines, BehaviorSpan is made up of a diverse group of individuals from different countries, races, beliefs, and faiths.  We embrace our diversity, and it makes us strong.  We will never discriminate against any individual based on their race, religion, sexual orientation, nationality, gender, sex, or beliefs.

RBT Direct Staff


Our direct care team are the core component of our program. They diligently work every day to help our clients learn as much as possible

Leadership Team


J.J. Tomash

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Nicole Da Lima Leitao

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Erin Lant

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Seidy Snyder

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Daisy Rogers

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Shannon Ralph

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