ABOUT

quincee-gideon-psychologist

I help people find clarity after confusing systems.

In the testing room, that means a diagnosis that finally explains the years of feeling different. In the classroom, it means training therapists to understand what high-control religion leaves behind.

The short version

Quincee Gideon, PsyD, is a licensed psychologist based in Santa Monica, California. She is the founder of Grey Matter Psychological Assessment, where she leads comprehensive psychological testing for ADHD, autism, and learning differences for children, teens, and adults, and the founder of Traumastery, a continuing education platform that has trained more than 150 therapists and coaches to work ethically with religious trauma and cult recovery.

Earlier in her career she spent over a decade specializing in trauma therapy, including EMDR and complex PTSD, before moving fully into assessment and education. She no longer provides therapy.

Two ways to work with me

Grey Matter Psychological Assessment

Comprehensive, evidence-based testing for ADHD, autism, and learning differences. Real clinicians, not a call center, and reports built to be used, not filed away.

Visit Grey Matter

Traumastery

CE courses and certification that train therapists and coaches to ethically treat religious trauma and cult abuse.

Explore Traumastery

The Long Version

I did not come to psychology through a straight path. I came to it through Uganda.

In 2010, while studying sociology at Texas A&M, I founded a nonprofit called the Nameless Project, running psychological rehabilitation programs for former child soldiers and child sex workers in Uganda, Rwanda, Burundi, and the Democratic Republic of Congo. Sitting with young people rebuilding a self after the unthinkable taught me the two things that still organize my work: people are extraordinarily resilient, and the right explanation of what happened to them is itself a form of treatment. That work became the subject of my dissertation, and I earned my doctorate in clinical psychology from Fuller Graduate School of Psychology, an APA-accredited program, in 2016.

My clinical training ran straight into the deepest end of human experience. At Patton State Hospital, a maximum-security forensic psychiatric hospital, I learned the discipline of psychological testing: psychodiagnostic assessment, neuropsychological batteries, competency and malingering evaluation. My internship and early licensed years were at Twin Towers Correctional Facility in Los Angeles, the largest mental health facility of its kind in the world, where I evaluated people for the Superior Courts to inform detainment, reintegration, and aftercare decisions. I still serve as an approved psychologist on the expert witness panels for Los Angeles and San Bernardino counties, evaluating competency to stand trial, capacity, LPS conservatorship, mental health diversion, and mitigation for LA County, federal court, and private attorneys.

For more than a decade I also built and ran a trauma therapy practice, Woven Together, where I supervised a team of eight therapists and specialized in complex trauma, EMDR, and a specialty that almost nobody was talking about when I started: religious trauma and cult recovery. Working with survivors of high-control religion changed how I understand harm, healing, and the systems people have to leave in order to become themselves. In 2020 that specialty became Traumastery, an NBCC-approved continuing education provider that has now trained more than 150 therapists and coaches to work ethically with religious trauma and cult abuse.

In 2026 I made the change my career had been building toward: I stepped out of the therapy room and into the testing room full time. I founded Grey Matter Psychological Assessment to fill a gap I kept seeing, people who suspected they were neurodivergent and could not find evaluations that were thorough, affirming, and actually useful in their real lives. I no longer provide therapy. Assessment is where I do my best clinical thinking, and it is where my forensic training shows up most: in the precision of every report.

Along the way, this work found a public audience. I have provided on-air commentary for Netflix's Dancing for the Devil: The 7M TikTok Cult, Hulu's Understanding Killers, and Peacock's Rise and Fall: Understanding Cults, been quoted in The New York Times, The Washington Post, Self, and Allure, appeared on podcasts from Therapy Chat to Sass Says, and co-host the Multiple Sources podcast.

“A diagnosis isn’t a label; it’s a map. My job is to hand you that map in a way that actually makes sense for your life, not just check a clinical box.”
— Quincee Gideon, PsyD
Credentials at a Glance
  • PsyD, Clinical Psychology, Fuller Graduate School of Psychology (APA-accredited), 2016
  • Licensed Psychologist, California, PSY 29352
  • Certified Neurodiversity-Affirming Provider, 2026
  • Member, American Psychological Association (APA)
  • Approved expert witness panel psychologist, Los Angeles and San Bernardino Counties
  • EMDR trained (Basic Training, Parts 1 and 2)
  • Approved CE provider, APA and NBCC, through Traumastery

Common Questions

Start with the right door

Testing for yourself or a family member, or training for your practice. Either way, it begins with a conversation.