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David Lewallen, Psy.D.


Dr. David Lewallen is a licensed psychologist who provides individual therapy services to adolescents, teenagers, adults, and older adults (10-65+). David works with individuals struggling with anxiety, depression, ADHD, hoarding, adjusting to life transitions including, relationship/interpersonal problems, spirituality/faith issues, defiance, and screen time.


Dr. Lewallen builds a collaborative relationship with each client to foster better understanding of how each person’s thoughts, feelings, and behavior affect one another and the family or friends around them. He collaborates with individuals to develop personalized evidenced based treatment plans while honoring each person’s unique background. David enjoys providing a warm, friendly, and appropriately humorous atmosphere in sessions. He incorporates the individuals intersecting identities including but not limited to race, ethnicity, identity, religion, socio-economic status, and physical ability to personalize therapy. David draws from an integrative approach utilizing Cognitive Behavioral Therapy (CBT), Acceptance and Commitment Therapy (ACT), and Humanistic perspectives in his clinical work.


In addition to therapy, Dr. Lewallen provides comprehensive psychological assessment primarily for ADHD. Psychological assessment includes cognitive, emotional, academic and/or neuropsychological measures to understand how some thinks, feels, and behaves. The resulting 

comprehensive psychological report provides recommendations tailored to the client, family, and referring providers.

Dr. Lewallen graduated from Pacific University with a doctoral degree in Clinical Psychology in 2020. He completed his pre-doctoral internship at Centerstone Consortium in Florida working in a community mental health center with adults and adolescents who struggled with anxiety disorders, mood disorders, behavioral issues, ADHD, schizophrenia, and adjusting to mild brain injuries. He performed psychological assessment with children to determine learning disorders, autism, ADHD, and behavioral issues. David’s post-doctoral work was done at Sundstrom Clinical services where he has continued to hone his therapy and assessment skills.


Beyond his clinical work, Dr. Lewallen and his wife enjoy traveling, disc-golf, exploring the PNW, triathlon (sprints to full Ironman distances), and spending time with family and friends. Outside of these activities he enjoys e-racing bicycles, plant tending, art, and reading.

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