Olivier Barthelemy, PhD

Living with OCD can feel like your mind is working overtime — intrusive thoughts, worry, and rituals that take up more space than you’d like. My work focuses on helping people find steadier ground through exposure and response prevention (ERP) and cognitive behavioral therapy (CBT) approaches. These evidence-based treatments reduce symptoms and build flexibility, helping you relate differently to uncertainty and regain a sense of control.

My approach is structured, collaborative, and calm — grounded in curiosity and clear communication. Together, we’ll create a framework for change to strengthen self-trust, manage anxiety effectively, and reconnect with what truly matters.

My clinical training at Boston University’s Center for Anxiety & Related Disorders (CARD) and the Edith Nourse Rogers Memorial VA Medical Center (clinical internship) focused on evidence-based approaches for anxiety, mood, trauma, and OCD. I also completed training in neuropsychology at the VA Boston Healthcare System, Brigham and Women’s Hospital, and Easterseals Capital Region & Eastern Connecticut (clinical fellowship), deepening my understanding of how brain processes shape emotion and behavior.

I focus on helping clients apply what they learn in therapy to real-world moments — in ways that strengthen confidence and build habits that support meaningful change.

I am committed to providing therapy that is respectful, inclusive, and attuned to each client’s background and lived experience. OCD and anxiety affect people in many different ways, and effective care requires both scientific precision and genuine empathy. My goal is to create a space where every client feels understood, supported, and empowered to build a life guided more by values than by fear.

At Catalyst Psychology, we believe that empathy and evidence go hand in hand — helping clients move toward greater confidence, calm, and connection.