APEX Summer Camp Staff
Alexa Matlack, PhD, NCSP, LP (she/her)
APEX Camp Director

Dr. Alexa is the Director of the APEX Summer Camp program. She was a part of the early years of APEX as a graduate student and returned following completing her studies as the Clinical Director, and now has transitioned to Camp Director. She has always loved working at summer camps and is passionate about supporting youth with building social skills and interpersonal relationships.
Dr. Alexa is a licensed psychologist and Assistant Teaching Professor of School Psychology at the University of Washington. She is a school psychologist by training and has worked with neurodiverse youth and families for several years, both providing direct clinical services and supporting families navigating special education and school systems. Dr. Alexa is a certified Parent Child Interaction Therapy (PCIT) practitioner and has extensive experience supporting parents with behavior management training and support through the Incredible Years program. She also supervises many clinical trainees in building their clinical and intervention skills toward providing culturally responsive and neurodiverse-affirming clinical practices for all youth and families.
Outside of work, Dr. Matlack can be found reading a good book, spending time with her orange tabby cat, and enjoying time outside with friends and family.
Email: matlacka@uw.edu
David (Dah-veed) Garcia, MA (he/him)
Program Director

I graduated from the University of West Florida with my master in Applied Behavior Analysis. During my time in my masters program I learned about Organizational Behavior Management and immediately wanted to dive head first into learning more because I strongly believe being an effective supervisor is extremely important to the success of not only our clients but staff too. I have been a RBT for over 7 years so I’ve taken what I’ve learned from my amazing supervisors and used those skills to become an effective mentor and leader.
During my free time I enjoy playing video games with my buddies, doodling/painting, fishing, hiking, trying new foods/ snacks, and playing with my corgi Jelly!
Rachel Sun, Ed.M., BCBA (she/her)
APEX Clinical Coordinator

I am a 5th year doctoral student in school psychology at the University of Washington. I had the amazing privilege to join APEX summer 2023 as a lead counselor. I have more than five years of experience providing culturally responsive behavioral and mental health support for neurodivergent children with diverse needs across settings. My research interest focuses on cultural adaptations of evidence-based practices and family training to serve families with children with autism from marginalized backgrounds.
The free time side of me loves camping, hiking, and spending free time in the woods 🙂
Hayley McAvoy, MA (she/her)
Consulting Clinical Supervisor

I am a 4th year school psychology PhD Candidate at the University of California, Riverside. I have spent three consecutive summers as a lead and head counselor at APEX; and co-facilitated APEX’s parent training during the school year. I have worked with neurodivergent children in a variety of settings (clinic, school, home). My research interest involves student-teacher relationship quality between with autistic students and educators, as well as training for teachers and paraprofessionals.
Outside of that, I like to run, bike, swim, hike — and just about anything else that involves being outdoors!
Carolyn Campbell, BA (she/her)
Clinical Supervisor

I am a 2nd year child clinical psychology PhD student at Ohio University. I have spent three consecutive summers as a counselor and lead counselor at APEX. My research interests are school-based interventions for children and adolescents with ADHD and factors that enhance teacher implementation of these interventions. I also have both a research and clinical interest in supporting LGBTQ+ students of all ages.
During my free time, you can find me rock climbing, cooking new recipes, checking out pop punk shows, and watching the greatest football team in the entire world, the Buffalo Bills.