Areas of Clinical Expertise

Adolescent Mental Health & Development
Trauma-Informed Care
Cognitive Behavioral Therapy (CBT)
Dialectical Behavior Therapy (DBT)
Acceptance and Commitment Therapy (ACT)
Family Systems Therapy
Integrative Psychology
Co-Occurring Disorders
Eating Disorders
Attachment-Based Therapy

“The most rewarding part is witnessing the moments of reconnection, understanding, and healing within the family system. Supporting families as they move from a place of disconnection to one of empathy, communication, and renewed trust is incredibly meaningful.” — Joanna O’Neill

Experience

Joanna O’Neill is a Licensed Marriage and Family Therapist (LMFT) with more than a decade of experience in clinical leadership and adolescent behavioral health. Her experience includes program design, team building, and clinical oversight in highly specialized residential and outpatient settings.

Before joining Muir Wood, Joanna served as Chief Clinical Officer at TrueCare Treatment Centers. In this role, she provided strategic clinical leadership, guided quality assurance initiatives, and supported integrated care teams in high-acuity settings. She also held multiple senior roles at the Eden Center for Eating Disorders, a gender-inclusive residential program focused on treating adolescents and adults with complex eating disorders, including anorexia, bulimia, and binge eating disorder.

Education

Joanna completed her undergraduate education at Pepperdine University, where she received a bachelor’s degree in psychology. Upon graduation, she attended Vanguard University of Southern California for her graduate studies. She holds a master’s degree in clinical psychology.

Role at Muir Wood

Joanna currently serves as Clinical Director of the Penngrove Program at Muir Wood where she leads her clinical team in delivering developmentally appropriate care rooted in empathy, structure, and relational connection. Her leadership style focuses on fostering cohesion, clinical consistency, and clarity of purpose across the treatment team, ensuring that every teen receives high-quality care from a connected and invested group of professionals.

Joanna approaches therapy with a relational, trauma-informed lens, grounded in the belief that authentic human connection is the foundation for healing and transformation. She views a strong therapeutic relationship and family engagement as two essential components of recovery. She works closely with interdisciplinary teams to ensure alignment in treatment planning, continuity of care, and a shared commitment to helping teens and families build more connected, resilient relationships.

Personal Interests

Outside of work, Joanna prioritizes quality time with her family and maintains a strong commitment to personal wellness. She enjoys staying active and finds renewal in the natural beauty of Sonoma County—whether hiking local trails, enjoying the outdoors, or simply spending time in peaceful surroundings. These moments of balance and connection reflect the values she brings into her leadership and clinical work.

About Muir Wood Teen Treatment

Muir Wood is a leader in adolescent mental and behavioral health that offers both outpatient and residential treatment programs in the state of California. Our programs are guided by clinical teams that specialize in co-occurring mental health and substance use disorders. We believe that treating the whole person—both their behavioral health and underlying mental state—leads to better outcomes for life-long healing. Meet our staff of therapists and psychiatrists for teens.

Learn more about what we treat and explore our treatment programs for teen boys and teen girls.