Ruth Aspy, Ph.D.
Licensed Psychologist, Co-Founder
Ph.D.Licensed Psychologist
Autism Diagnosis & Assessment
The Ziggurat Group
Center-based in Dallas, TX
Accepting new clientsCenter-based
Contact this providerFree for families · no spam
Ages served
Children and adults (staff bios reference birth–18 and adults; Susan Jamieson serves ages 3–21)
Availability
Accepting new clients
Setting
Center-based
Languages
English
Overview
Autism Diagnosis & Assessment in Dallas
Co-founders Dr. Ruth Aspy and Dr. Barry Grossman built this Dallas practice around a framework they created—the Ziggurat Model—that won the Autism Society's Literary Achievement Award. Their team brings together psychologists, a speech-language pathologist, an occupational therapist, and an educational diagnostician to run coordinated autism evaluations rather than siloed single-discipline reports. Children, adolescents, and adults are served at the Campbell Road clinic in North Dallas.
Best for
Families who want one coordinated team to cover psychological, language, sensory-motor, and educational testing in a single evaluation process rather than chasing separate appointments.
Their approach
Rather than treating surface behaviors, the Ziggurat Model framework directs every evaluation toward identifying the underlying neurological and sensory needs driving those behaviors—then builds supports across five levels. The team works together during assessment so findings across disciplines inform each other before the final report.
What to expect
Reach the office at 214-227-7741 or info@texasautism.com; self-pay clients receive a written Good Faith Estimate before scheduling, and Dr. Grossman's patients can access a secure client portal for ongoing communication.
Services
Services & specialties
- Age Range
- Ages 3 and up through adulthood
- Deliverables
- written reportGood Faith Estimate provided
- Evaluator Types
- licensed psychologistspeech-language pathologistoccupational therapisteducational diagnostician
- Scope Of Testing
- autism diagnosis
- intellectual/cognitive assessment
- academic achievement
- speech and language
- receptive and expressive language
- articulation
- pragmatic language
- pre-verbal language
- sensory and motor assessment
The people
Meet the The Ziggurat Group team
Team includes 1 speech therapist, 1 occupational therapist.
Barry G. Grossman, Ph.D.
Licensed Psychologist, Co-Founder
Ph.D.Licensed PsychologistEMDRIA Certified TherapistEMDRIA Certified Therapist
Licensed psychologist (TX #32169) and EMDRIA Certified Therapist, Dr. Grossman specializes in both counseling and formal assessment for autistic individuals and their families, with a secondary focus on females on the spectrum. He co-authored the Ziggurat Model book and sits on the Autism Society's Panel of Professional Advisors.Read more
Susan B. Jamieson, M.Ed. RPED
Registered Professional Educational Diagnostician
M.Ed.RPEDRPED
A Registered Professional Educational Diagnostician with more than 35 years in Texas special education—including two decades in an administrative role—Susan conducts intellectual and academic assessments for students ages 3–21 and contributes to team autism evaluations.Read more
Dawn Olivares, BSOT, OTR
Occupational Therapist
BSOTOTR
Board-certified occupational therapist (Creighton University, 1997) with a pediatric and sensory-motor specialty; Dawn is part of the autism assessment team and has hands-on experience designing sensory diets for children with ASD across home, school, and clinic settings.Read more
Nicole Brin, M.A., CCC-SLP
Speech-Language Pathologist
M.A.CCC-SLPCCC-SLP
Nicole holds her CCC-SLP from the University of North Texas and has spent over a decade in school, private clinic, and pediatric hospital settings working with clients from birth through adulthood, with deep experience in autism-related language evaluations, infant feeding, and selective-eating therapy.Read more
Good to know
Common questions about The Ziggurat Group
Will I receive a report I can share with my child's school?
Yes — The Ziggurat Group provides a formal written evaluation report for your child's school and care team. That documentation can support IEP or 504 requests at school.
What ages does The Ziggurat Group serve?
The Ziggurat Group serves ages Children and adults (staff bios reference birth–18 and adults; Susan Jamieson serves ages 3–21). If your child is near the edge of that range, it's worth reaching out — providers often make case-by-case decisions.
Where is The Ziggurat Group located?
The Ziggurat Group is located at 17430 Campbell Rd #112, Dallas, TX 75252, serving families throughout Dallas and the surrounding area. If getting there is difficult, ask whether telehealth or in-home options are available.
Is The Ziggurat Group accepting new clients?
The Ziggurat Group is currently accepting new clients in Dallas. Sharing your child's age and insurance up front helps them tell you quickly whether they're a fit — availability can change fast.
Ratings sourced from Google. Autism Services Finder verifies listings but doesn’t endorse providers. Updated July 2026.
17430 Campbell Rd #112, Dallas, TX 75252
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