Sean Dunn PMHNP-BC

Sean is a board-certified psychiatric mental health nurse practitioner who serves the greater Seattle area. He graduated summa cum laude with a Bachelor of Science in Nursing from Northeastern University. He received a Master of Science in Psychiatric and Mental Health Nursing from Vanderbilt University, one of the top programs in the country, where he was awarded a named scholarship for his academic performance. Sean has garnered clinical experience in a variety of prestigious settings, including Mclean Hospital, the largest psychiatric teaching hospital of Harvard Medical School, Boston Children’s Hospital, and several outpatient behavioral health private practices.

Sean is committed to an empathetic approach toward clients. Above all when seeking treatment, clients should feel heard and validated throughout the process. Having been on both sides of the mental health client-provider relationship, Sean sees honesty, respect, and a clear understanding of clients’ unique circumstances as paramount to the success of the relationship. Sean takes a uniquely collaborative approach with clients, placing an emphasis on teaching an understanding of mental health conditions and the unique treatment options available to treat them. Upon this mutual foundation, Sean and clients together decide on appropriate treatment plans that best suit them.

Sean is most interested in providing medicine management for mood and behavioral disorders such as anxiety and depression spectrum disorders, ADHD and OCD. He is certified in trauma-informed cognitive behavioral therapy. Sean warmly welcomes clients of all ages, backgrounds, orientations, and identities.

Outside of his clinical practice, Sean enjoys spending time outdoors in the PNW with his family, writing and reading genre fiction, replaying 90’s video games, listening to mental health podcasts while walking his dog, lamenting the final season of Game of Thrones, and catching up on the latest tv show.


Amy Brumbaugh, PMHNP-BC

Amy is excited to join ATC Psychiatry as a board-certified psychiatric nurse practitioner. Amy received her Doctor of Nursing Practice from Seattle University, after receiving her Bachelor of Science in Nursing from Seattle University and Bachelor of Arts in Sociology at University of Oregon’s Robert D. Clark Honors College. Amy brings experience in providing care to patients spanning a wide range of mental health conditions and backgrounds. With her knowledge obtained from previous work in the fitness industry, Amy brings a comprehensive approach to mental health that encompasses not only medication management but also tailored supplement, exercise, and lifestyle modification ideas for every diagnosis.

In her practice, Amy is passionate about reducing the stigma associated with mental illness and finds significant value in the power of collaborative care, working closely with patients, their families, and multidisciplinary roles to ensure comprehensive and effective treatment. Amy takes pride in creating a safe and nurturing environment where her patients feel heard and valued. She prioritizes evidence-based practices alongside a deep respect for cultural and individual diversity, and the nuances that brings to the mental health field.

Outside the clinical realm, Amy loves challenging her knowledge at trivia nights, keeping up with the latest in the Marvel cinematic universe, lifting heavy weights at the gym, and going on hikes with her German Shepherd, Mika.