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Meet the Team
Therapy | Coaching | Intensive Treatment
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Founder
Dr. Allmann graduated summa cum laude from the University of Missouri with her undergraduate degree in psychology and received her PhD in clinical psychology from Stony Brook University, one of the top ten programs in the nation. She then obtained specialty postdoctoral training in the treatment of OCD and its common co-occurring disorders at Harvard Medical School’s McLean Hospital (OCD Institute). More recently, Dr. Allmann worked as an Assistant Professor at Columbia University, where alongside valued colleagues, she spearheaded the launch of Columbia’s Anxiety Day Program, which provides intensive and accelerated care for adolescents with severe anxiety, OCD, or school avoidance. She also is a founding member of CopeColumbia, an effort to maintain the wellbeing of Columbia Medical Center’s health care workers in the wake of the COVID-19 pandemic.
Dr. Allmann uses evidence based treatments such as exposure and response prevention (ERP/EX/RP), prolonged exposure (PE), cognitive behavioral therapy (CBT), and acceptance and commitment therapy (ACT) to treat a variety of anxiety and mood based syndromes. She has published several book chapters and peer-reviewed research articles on parenting, OCD, depression, COVID impacts, and the development and trajectory of mental health over the lifespan. Dr. Allmann loves to supervise and teach the next generation of therapists and to that end, she has taught several clinical workshops spanning topics such as parenting, anxiety in schools, and clinical best practices.
Dr. Allmann uses these experiences to leverage change in the lives of those who connect with her through her private practice.
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.