Dr. Mckinzie Duesenberg-Marshall
PHD · LCP · NCSP · ADOS-2 CERTIFIED
Hello!
I'm Dr. McKinzie, a licensed clinical psychologist and nationally certified school psychologist with a rare dual expertise — one that bridges clinical practice and the world of schools, giving families a provider who sees the full picture.
Based in St. Charles, MO, I serve children, adolescents, and families in person and via telehealth across PSYPACT-participating states.
MO LICENSE
#2025021316
IL LICENSE
#071.011421
PSYPACT
#22917
Background and Mission
A different kind of Child Psychologist
"Every child has the capacity to grow. They just need someone who sees them clearly — and knows how to help."
Dr. McKinzie earned her BA from Lindenwood University before completing her MA and PhD in Educational, School, and Counseling Psychology at the University of Missouri-Columbia — one of the country's leading programs at the intersection of clinical care and education.
That dual training shaped everything about how she practices. When she evaluates a child, she isn't just administering tests — she's building a complete picture of how that child thinks, learns, and feels, and what that means for their life at school, at home, and in the world.
As the founder of Minds in Progress, Dr. McKinzie created a practice where families don't have to navigate a fragmented system. Evaluations, therapy, parent coaching, and school consultation are available in one place, from a provider who understands the full context.
She is LGBTQIA+ affirming and committed to inclusive, culturally responsive care for every family she serves.
Education & Credentials
Credentials that matter to you child's care
Education
PhD, Educational, School & Counseling Psychology
University of Missouri-Columbia
MA, Educational, School & Counseling Psychology
University of Missouri-Columbia
BA
Lindenwood University
Licensure & Certification
Licensed Clinical Psychologist (LCP)
Missouri · #2025021316
Licensed Clinical Psychologist (LCP)
Illinois · #071.011421
PSYPACT Authority
Multi-state telehealth · #22917
Nationally Certified School Psychologist (NCSP)
NASP Certification
ADOS-2 Certified
Autism Diagnostic Observation Schedule, 2nd Ed.
Professional Memberships
American Psychological Association
APA
National Association of School Psychologists
NASP
Council for Exceptional Children
CEC
855+
GOOGLE SCHOLAR CITATIONS
Research-Grounded Practice
Dr. McKinzie is an active research contributor whose work spans psychoeducational assessment, school psychology, and child development. The evaluation methods and interventions at Minds in Progress are evidence-based — and informed by ongoing engagement with the field.
2
STATE LICENSES + PSYPACT TELEHEALTH
More About Me
Education and Training:
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Bachelor of Arts: Lindenwood University
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Master of Arts: University of Missouri - Columbia
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PhD in Educational, School, and Counseling Psychology: University of Missouri - Columbia
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APA Pre-Doctoral Internship: Illinois School Psychology Internship Consortium - Livingston County Special Services Unit
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Post-Doctoral Internship/Fellowship: Thrive Child Psychology
Areas of Focus:
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Academic and Behavior Progress Monitoring and Consultation
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Advocacy (attending 504/IEP meetings)
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Autism Spectrum Disorder (ASD): Extensive training/experience in ADOS-2
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Attention-Deficit Hyperactivity Disorder (ADHD)
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Co-Parenting
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Comprehensive Evaluation (Psychoeducational, Neuropsychological, Developmental, Autism, ADHD, Social-Emotional, Giftedness) with Children (5+), Teens, and Adults
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Divorce
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Eating Disorders
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Emotional and Behavioral Functioning (Anxiety, Depression, Mood Disorders, Adjustment Difficulties, Self-Esteem, Anger Management, Emotional Regulation, Behavioral Challenges, Stress Management, Social Skills, Impulse Control, Trauma, Grief & Loss)
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Executive Functioning Difficulties
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Intellectual Disability (ID)
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Learning Disability (LD - dyslexia, dyscalculia, and dysgraphia)
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LGBTQIA+ Support
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Obsessive Compulsive Disorder (OCD - Exposure Response Prevention)
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Parent Coaching, Training, Support
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Professional Development
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Supervision
Credentials:
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Licensed Clinical Psychologist, Illinois #071.011421
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Licensed Psychologist, Missouri #2025021316
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PSYPACT Certified, Mobility #22917
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Nationally Certified School Psychologist
Professional Memberships:
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American Psychological Association
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Council for Exceptional Children
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National Association of School Psychologists
Contact
Let’s work together to support your child’s success—reach out today!
314-744-9535
Frequently Asked Questions
Where are you located?
We are located at 3930 South Old Highway 94 in St. Charles, Missouri - however can travel for testing purposes. Dr. McKinzie can provide telehealth services to any PSYPACT participating state.
How much do services cost?
Self-pay rates for therapy are $200 for intake sessions and $150 for follow-ups; testing is approximately $1,500-$3,000, depending on the assessment measures used and what is being evaluated.
Do you accept insurance?
We are currently a self-pay practice and do not accept insurance at this time. However, we're happy to provide you with a detailed superbill that you can submit to your insurance company for potential out-of-network reimbursement.