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Ross Ellenhorn, PhD

For the past three decades, Dr. Ellenhorn has been a pioneer and leader in the development and promotion of community integration services, types of care that serve and empower individuals diagnosed with psychiatric and/or addiction issues outside institutional settings, and in their own communities. Trained as a sociologist, psychotherapist and social worker, Dr. Ellenhorn created the first fully-operating intensive hospital diversion and wrap-around program in Massachusetts. He later created and led one of the nation’s first Programs for Assertive Community Treatment teams in that state.  

He is the founder and owner of Ellenhorn, the most robust community integration program in the U.S. In addition, Dr. Ellenhorn is the co-founder and president of the Association for Community Integration Programs (A4CIP), a professional association representing and promoting programs dedicated to empowering clients who are receiving services while living and participating in their community.

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Andrew Tatarsky, PhD

Dr. Tatarsky has devoted his career to developing a comprehensive understanding of the broad spectrum of substance use problems and the development of an integrative harm reduction psychotherapy approach to treating that spectrum.  This treatment is described in his book, Harm Reduction Psychotherapy: A New Treatment for Drug and Alcohol Problems.   An internationally recognized leader in the treatment of substance misuse and other potentially risky behaviors, he has specialized in the treatment of addiction for 35 years as a counselor, psychologist, program director, trainer, advocate and author. He trains professionals nationally and internationally.

Dr. Tatarsky is founder and executive director of the Center for Optimal Living in New York City where treatment and professional training is based on his model of Integrative Harm Reduction Therapy (IHRP). The center is one a growing number of treatment centers fully and radically committed to the harm reduction framework for helping people make positive change in their lives. The center is also committed to helping to change the dominant addiction/recovery toward one fully informed by harm reduction principles of compassion, collaboration, empowerment and personal choice.



Ellenhorn was founded in Boston in 2005 by Dr. Ross Ellenhorn and Dr. Madhavi Prakash on the idea that psychiatric recovery and recovery of a sense of purpose, hope, and faith in oneself as going hand-in-hand. Ellenhorn provides psychiatric care while supporting their clients’ pursuit of life goals and their connection to the larger community. As an alternative to traditional residential settings and hospitals, Ellenhorn is the most intensive program in the US focused on a “treatment without walls” approach to psychiatric needs. We believe that the mutually dependent goals of psychiatric and social recovery are impossible to achieve without a strong collaborative relationship with our clients. That’s why our clients are leaders in their own care. We place their goals for the future front and center in our treatment.

The Center for Optimal Living is a treatment and training center for addiction and mental health in New York City. Our approach utilizes Integrative Harm Reduction Psychotherapy (IHRP), developed by our founder and director, Dr. Andrew Tatarsky. The Center for Optimal Living, with its team of twelve dedicated clinicians, is the only private treatment center that offers this unique form of therapy. The cornerstone of IHRP is a collaborative, therapeutic relationship that “starts where the person is.” We specialize in helping people figure out whether moderate, less harmful substance use, or abstinence is best suited for them., We tailor our services to help our clients pursue their chosen goal. The Center for Optimal Living also provides trainings, supervision, and consultation to professionals and organizations. We are actively involved in advocacy efforts to support the needs of those impacted by mental health issues and substance misuse.