Niles Cook, PsyD
OCD & Anxiety Specialist | Exposure and Response Prevention (ERP) Therapy in Northern Virginia
Dr. Niles Cook, PsyD is a licensed clinical psychologist specializing in the treatment of obsessive-compulsive disorder (OCD) and anxiety disorders in Northern Virginia. He provides evidence-based therapy using Exposure and Response Prevention (ERP), the gold-standard treatment for OCD. Dr. Cook works with adults, adolescents, and high-functioning professionals who feel stuck in cycles of intrusive thoughts, compulsions, perfectionism, and anxiety.
Approximately 70% of Dr. Cook’s clinical work is dedicated to OCD and related disorders. He has extensive experience treating a wide range of symptom presentations, including complex and treatment-resistant cases, and brings a structured, active, and collaborative approach to care.
Who I Work With
Dr. Cook primarily works with adults and high-functioning professionals struggling with OCD and anxiety.
He also has experience working with adolescents and may be a good fit for older teens depending on clinical needs and goals.
He frequently works with:
OCD (all subtypes, including intrusive thoughts and mental compulsions)
Perfectionism and fear of mistakes
Rumination and overthinking
Panic and generalized anxiety
High-functioning individuals navigating demanding environments
OCD, including intrusive thoughts related to harm, relationships, and identity (including perinatal/postpartum OCD)
Clients often come to treatment feeling stuck, frustrated, or discouraged — especially if they’ve tried therapy before without lasting change.
How I Work
Dr. Cook’s approach is structured, goal-oriented, and grounded in evidence-based care.
He primarily uses:
Cognitive Behavioral Therapy (CBT)
Treatment focuses on:
Reducing compulsive behaviors and avoidance
Building tolerance for uncertainty
Supporting long-term behavioral change — not just short-term relief
Sessions are active and collaborative. Clients are guided through targeted interventions designed to help them regain freedom from anxiety-driven patterns.
Co-Occurring Concerns
When OCD co-occurs with depression, mood concerns, or other anxiety symptoms, treatment is tailored to the full clinical picture.
Dr. Cook integrates:
Emotional regulation work
Behavioral activation
Cognitive restructuring
A strong therapeutic relationship is central to his work. He prioritizes building a collaborative, trusting environment where clients feel supported while engaging in meaningful, challenging change.
Background & Training
Dr. Niles Cook, PsyD is a licensed clinical psychologist with over 10 years of clinical experience, including more than 7 years specializing in OCD treatment.
His background includes:
Providing ERP within a specialty OCD and anxiety clinic
Supervising doctoral trainees delivering ERP
Teaching and supervising graduate-level clinicians
Experience across outpatient, hospital, and community mental health settings
He has worked with children, adolescents, and adults across a wide range of clinical environments, with increasing specialization in OCD and anxiety disorders.
Diversity & Inclusion
Dr. Cook provides affirming, evidence-based care to individuals from diverse backgrounds, including LGBTQIA+ clients.
He has specific experience working with:
OCD themes related to identity and sexuality
The impact of minority stress on anxiety and mental health
His approach is grounded in cultural humility, respect, and a commitment to understanding each client’s unique context.
Location + Logistics
Dr. Cook is based in Northern Virginia and offers:
In-person therapy in Vienna, VA
Virtual therapy throughout Virginia
Get Started
If you’re looking for structured, evidence-based treatment for OCD or anxiety, you can reach out to schedule a consultation.