Summit Therapy Center

Summit Therapy Center At Summit Therapy Center, we provide specialized mental health services for children, adolescents, and families across our two Montana locations. Our work is grounded in the belief that healing happens through safe, connected relationships and developmentally appropriate interventions. We primarily serve children navigating complex trauma, neurodivergent profiles (including ADHD and autism), anxiety, depression, and behavioral challenges. We also support families in building stronger relationships, improving emotional regulation, and creating more connected home environments. Our approach is rooted in play therapy, attachment-based care, and experiential interventions, allowing children to express, process, and grow in ways that match their developmental needs. We integrate evidence-based models such as AutPlay Therapy, along with sensory, movement-based, and relational approaches to support the whole child. Across both locations, our team brings a range of specialties, including: Play therapy and child-centered approaches Trauma-informed care Neurodiversity-affirming treatment Family support and parent coaching Psychological evaluation and consultation We believe that while many challenges emerge within relationships, healing also happens through them. Our goal is to create a space where children and families feel understood, supported, and empowered to move toward meaningful change. Our Team Daysi B. Onstad, MsPsy, LCPC, RPT-S Certified AutPlay Provider | Registered Play Therapist – Supervisor 📞 406.272.2606 ✉️ DOnstad@SummitTC.org Daysi specializes in working with children and families impacted by complex trauma, neurodivergence, and significant life stressors. Her background in psychology and special education informs a deeply relational and culturally responsive approach to care. Matthew J. Onstad, MS, LCPC, NCC Certified AutPlay Provider 📞 406.272.2318 ✉️ MOnstad@SummitTC.org Matthew provides play therapy for children and teens, focusing on emotional regulation, resilience, and skill-building. He integrates evidence-based practices with a developmentally attuned approach. A therapy dog is incorporated into sessions when appropriate. Karli M. Storey, MEd, LCPC Certified AutPlay Provider 📞 406.647.0124 ✉️ KStorey@SummitTC.org Karli works with children and families using a holistic, play-based approach. Her background in school counseling informs her understanding of academic, social, and emotional needs across settings. Jason C. Moss, MA, LCPC 📞 406.272.2442 ✉️ JMoss@SummitTC.org Jason has over 15 years of experience supporting children and adolescents with anxiety, depression, ASD, developmental differences, and behavioral challenges. He utilizes a client-centered approach incorporating play, art, and talk therapy. Molly J. Adair, MS, PCLC, LMT 📞 406.530.9880 ✉️ MAdair@SummitTC.org Molly works primarily with children using creative and integrative approaches that include play, movement, art, and connection. She has a strong interest in animal-assisted and equine-based therapy. Kelli Mullen, LCSW 📞 406.534.9126 ✉️ KMullen@SummitTC.org Kelli works with children, teens, and families using play-based and person-centered approaches. She brings experience from both school and clinical settings and focuses on building strong therapeutic relationships. Angela Wagenaar, PhD, LP Dr. Wagenaar is a licensed psychologist with nearly 20 years of experience. She specializes in psychological evaluation, diagnostic clarification, and working with children, adolescents, and young adults with complex developmental, behavioral, and medical needs. Jessica Raisa Gagakuma, MS, PCLC 📞 406.647.0680 ✉️ JGagakuma@summitTC.org Jessica "Raisa" is a Professional Counselor Licensure Candidate with a Master’s degree in Clinical Rehabilitation and Mental Health Counseling. She has experience providing individual therapy, co-facilitating equine-assisted therapy, and working with children and families in ABA, school, and classroom settings. Raisa is passionate about supporting individuals in developing skills, building resilience, and experiencing meaningful personal growth within a supportive therapeutic relationship.