About Comprehensive Assessment Services
Led by Licensed Educational Psychologist Donald Ghrist, LEP, Comprehensive Assessment Services (CAS) provides Independent Educational Evaluations (IEEs) across California. With over 25 years of experience, CAS is trusted by parents and districts for clear, defensible, IEP-ready recommendations.
Meet the Founder
Donald Ghrist is a Licensed Educational Psychologist (LEP #2703) with more than 25 years of experience in education and special education. As a former Coordinator of Special Education and founder of a nonpublic school for students with autism, Don brings practical insight into every evaluation. CAS was created to serve families and districts with evaluations that are objective, thorough, and student-centered.
Credentials & Expertise
About CAS
CAS was founded to bridge the gap between families and districts by providing Independent Educational Evaluations that are clear, compliant, and student-focused. Our evaluations go beyond testing—they help IEP teams make informed decisions about eligibility, services, and placement.
- Objective, unbiased assessments
- Statewide California service with virtual options
- Typical 30-day turnaround
- Collaboration with parents and LEAs
About CAS — Frequently Asked Questions
What services does CAS provide?
Where does CAS provide evaluations?
How quickly are reports delivered?
Does CAS work with both parents and school districts?
Who leads the evaluations at CAS?
Work with CAS
Get clear, unbiased Independent Educational Evaluations with practical, IEP-ready recommendations.