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Meet the Team
Therapy | Coaching | Intensive Treatment
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Founder
Dr. Anna Allmann is a licensed clinical psychologist who brings warmth, expertise, and a collaborative approach to individuals and families navigating anxiety, OCD, and related challenges.
Before entering private practice, Dr. Allmann completed specialized training in OCD and PTSD at Harvard Medical School's McLean Hospital and the Northport VA, respectively. She then served as an Assistant Professor at Stony Brook University and later at Columbia University, where she helped launch the Anxiety Day Program. Today, Dr. Allmann draws on evidence-based approaches, including exposure therapies, cognitive behavioral therapy, and third wave acceptance-based interventions. She has published research on OCD, depression, and parenting, and enjoys teaching and mentoring the next generation of therapists.
Above all, Dr. Allmann is passionate about combining her clinical expertise, research background, and genuine care for others to support clients in making meaningful, lasting changes in their lives.
Professional affiliations
The International OCD Foundation (IOCDF)
National Register of Health Service Psychologists credentialed
The Association for Behavioral and Cognitive Therapies (ABCT)
American Psychological Association (APA)
Association for Contextual Behavioral Science (ACBS)
The Association for Psychological Science (APS)
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Therapist
Nathan Siegel specializes in treating OCD, anxiety and related disorders with children, adolescents, and adults. Nathan values building a collaborative therapeutic relationship with each client, as well as basing therapeutic decisions on solid scientific evidence, to ensure that therapy is as helpful as possible.
When working with individuals with anxiety or depression symptoms, Nathan draws from well-established strategies such as cognitive behavioral therapy (CBT) and mindfulness. In working with OCD, Nathan has received extensive training in exposure and response prevention (ERP), long considered the gold-standard treatment, as well as inference-based CBT (ICBT), a newer treatment with a strong emerging evidence base that does not require exposures. Every situation is unique, and Nathan works with each client to determine which treatment is best for them.
Prior to joining the mental health field, Nathan was an elementary and middle school teacher for many years, an experience which informs his clinical work with children and families. Nathan also has significant experience working with members of the LGBTQ+ community, including trans individuals, and always seeks to provide affirming care.
Nathan completed his graduate practicum experience with Dr. Anna Allmann, and his graduate internship at the New England Center for OCD and Anxiety (NECOA). He is a member of the International OCD Foundation (IOCDF), and has facilitated workshops for children, teenagers and adults at the annual IOCDF conference several years in a row. Nathan earned his MA in Mental Health Counseling from the City University of New York (CUNY) – Baruch College, and holds a Bachelor's Degree from Swarthmore College.
He is currently working under the supervision of Anna Allmann and holds a limited permit.