Dr. Joseph Nissenfeld, MD is a highly regarded psychiatrist with specialized expertise in addiction psychiatry and a distinguished record of helping individuals achieve lasting recovery. He earned his B.A. from Yeshiva University and his M.D. from the Albert Einstein College of Medicine, before completing his psychiatry residency at Long Island Jewish Medical Center and a fellowship in addiction psychiatry at NYU School of Medicine.

With over 12 years of experience at Bellevue Hospital in New York City, Dr. Nissenfeld has provided exemplary direct patient care while also taking on key leadership and administrative roles in one of the nation’s most dynamic medical settings. In addition, he serves as Medical Director for Achieve Behavioral Health, overseeing five locations and shaping clinical standards of care.

Dr. Nissenfeld brings both clinical excellence and visionary leadership to his work, combining evidence-based practice with a deep commitment to patient-centered recovery.

Eric Gottlieb, LMHC, brings over 11 years of leadership experience overseeing both residential and outpatient treatment programs. As a practicing therapist, Eric integrates a range of evidence-based and client-centered approaches, including Psychodynamic Therapy, Cognitive Behavioral Therapy (CBT), Internal Family Systems (IFS), and trauma-informed interventions.

His passion for the field is grounded in a deep belief that human beings have the capacity to transform themselves—and, in doing so, create meaningful change in the world. In his free time, Eric can be found hanging out with his two dogs, hiking in the wilderness, and talking endlessly about Hip-Hop.

Rebecca is a Licensed Clinical Social Worker (LCSW) with 12 years of experience, specializing in guiding individuals through the challenges of substance use disorders. Driven by empathy and a passion for mental health, she creates a compassionate space that fosters healing and growth. Committed to developing innovative programs, she empowers clients on their recovery journey and promotes holistic well-being. Her dedication to transformative practices ensures that each individual feels supported and valued in their therapeutic process.

In her free time, Rebecca can be found walking her dog around Brooklyn, exploring new coffee shops and in the warmer months, surfing or swimming at the beach. She is an avid reader and loves yoga and running.

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