Niles T. Cook, PsyD

Psychologist

Clinical Director

8245 Boone Blvd
Suite 630
Vienna, Virginia 22182
  • LGBTQIA+ Affirming
  • ADA Accessible
Narrative of Services:

Dr. Niles Cook, PsyD specializes in the treatment of obsessive-compulsive disorder (OCD) and related anxiety disorders in adults. Approximately 80% of his clinical work is dedicated to OCD. He provides evidence-based treatment using Exposure and Response Prevention (ERP) and has worked with individuals across a wide range of symptom presentations and severity levels, including complex and high-functioning cases.

Dr. Cook has extensive experience delivering ERP within specialty settings and has supervised doctoral trainees providing OCD treatment. His approach is structured, collaborative, and focused on helping clients step out of cycles of doubt, avoidance, and reassurance-seeking.

Treatment of Co-occurring Disorders:

When OCD co-occurs with anxiety, mood concerns, or tic-related symptoms, treatment is integrated and tailored to the full clinical picture. Dr. Cook uses Cognitive Behavioral Therapy (CBT) and Exposure and Response Prevention (ERP) to address both OCD symptoms and related patterns such as avoidance, rumination, and emotional dysregulation.

He places a strong emphasis on building a collaborative therapeutic relationship, recognizing that meaningful progress is supported by both effective treatment strategies and a strong working alliance.

Training Description:

Dr. Niles Cook, PsyD is a licensed clinical psychologist with 10 years of clinical experience, including over 7 years specializing in OCD treatment. The majority of his clinical work focuses on OCD and related disorders.

He previously practiced in a specialty anxiety clinic focused on ERP for OCD, where he also supervised doctoral trainees delivering ERP. This experience informs his work with complex, high-functioning, and treatment-resistant presentations.

Diversity Statement:

Dr. Niles Cook, PsyD has extensive experience working with individuals from diverse cultural, religious, and identity backgrounds, including LGBTQIA+ clients. He provides affirming, evidence-based care and is experienced in treating OCD themes related to identity, sexuality, and morality.

His approach is grounded in cultural humility, respect, and an understanding of how identity and context shape mental health experiences.