Tanner Simpson

Dr. Tanner Simpson is a post-doctoral Psychologist Candidate, and the Director of Psychological Services at Firefly Autism. Dr. Simpson earned his BA in Psychology from the University of Wyoming and went on to receive his MA and Doctor of Psychology (Psy.D.) in School Psychology from the University of Colorado Denver, one of only 14 School Psychology Psy.D. programs in the country to receive accreditation by the American Psychological Association. Dr. Simpson is a Licensed School Psychologist in
the state of Colorado and is recognized as a Nationally Board-Certified School Psychologist. Throughout Dr. Simpson’s graduate education, he received specialized training in the developmental and neuropsychological assessment of toddlers, children, and adolescents; specifically related to the evaluation of autism spectrum disorders, learning disabilities, intellectual and executive functioning, developmental challenges, attention-deficit hyperactivity disorder, anxiety, depression, and behavioral difficulties. He completed a clinical externship at Urban Peak Homeless Shelter, focusing on evaluating and assessing psychiatric disorders among adolescents and young adults. Dr. Simpson also received in-depth training on the assessment, diagnosis, and treatment of autism spectrum disorders during his one-year internship training program at Firefly Autism, specifically related to the Autism Diagnostic Observation Schedule- Second Edition (ADOS-2)—the “gold standard” for autism evaluation. As a practicing psychologist candidate and licensed school psychologist, Dr. Simpson’s experience and training in the schools offer him the unique ability to navigate between the educational context and clinical settings. With an in-depth understanding of special education laws and procedures as well as advanced knowledge pertaining to the effective implementation of support and interventions for students in the classroom, Dr. Simpson has extensive experience supporting and advocating on behalf of families when attempting to find common ground during the Special Education evaluation process.
Dr. Simpson conceptualizes the evaluation process as a collaborative journey between all relevant stakeholders and values the opportunity to work directly with families throughout each stage of the assessment process. Using evidence-based approaches, Dr. Simpson believes in a comprehensive assessment model to individualize treatment recommendations based on a child’s unique set of strengths and needs. He understands the profound implications that well-versed, comprehensive psychological evaluations can have on enhancing the lives of children and their families. Dr. Simpson is practicing under a psychologist candidate license (PSYC.00014485) as he completes his work toward licensure as Licensed Psychologist. Dr. Tanner Simpson is supervised by Dr. Terry Katz, Ph.D.

Tanner Simpson, Psy.D | Director of Psychological Services 
Main: (303) 759-1192 
Cell: (720) 795-5071
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Dr. Terry Katz, PhD

Terry Katz earned her Bachelor’s Degree from the University of Michigan in 1982. She has a Master’s Degree (1985) and Doctoral Degree (1992) in Child Clinical Psychology from the University of Denver and is a Licensed Psychologist in Colorado (License #1921). She completed a Predoctoral Internship (1987) and a Postdoctoral Fellowship (1994) at the University of Colorado School of Medicine.

Firefly Autism is a 501(c)(3) organization registered in the state of Colorado. Donations are tax-deductible.


2001 Hoyt Street
Lakewood, CO 80215

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