Mary Poupon, PMHNP

Dr. Nelson is a board-certified psychiatrist who attended the University of Iowa Medical School and completed her psychiatry residency and child and adolescent psychiatry fellowship at Walter Reed National Military Medical Center.  She has extensive experience treating active-duty service members, family members of active duty and the veteran population.  She feels comfortable working with a wide range of age groups and enjoys treating challenges with anxiety, mood, sleep, and concentration.

Dr. Nelson believes that the key to success in mental health care is being able to establish a trusting and open relationship between psychiatrist and patient.

While initial sessions include the need to gather background information about the patient overall as well as the symptoms of concern, subsequent sessions are focused on learning the impact of the treatment.

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Background and credentials

Dr. Kristina Schnitzer is a board-certified psychiatrist. She earned her medical degree from the New York University School of Medicine and completed her residency in Adult Psychiatry at the Massachusetts General Hospital/McLean Adult Psychiatry Residency Program. She further specialized by completing a one-year clinical and research fellowship in Public and Community Psychiatry through Massachusetts General Hospital and the Massachusetts Department of Mental Health. In addition to her medical training, she holds a Master of Public Health (MPH) from the Harvard T.H. Chan School of Public Health. She has over three years of experience practicing psychiatry across inpatient, emergency, and outpatient settings.

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Treatment approach

Dr. Schnitzer focuses on medication management as the foundation of her treatment approach, typically combining it with supportive or emotionally focused therapy during 30-minute follow-up visits. She takes a collaborative and individualized approach to patient care and, when needed, may recommend additional therapy by integrating a therapist into the care team to ensure the best possible outcomes. She has experience treating a broad range of psychiatric disorders in various clinical settings.

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What you can expect in a first visit

Patients can expect a thorough and structured evaluation in their first visit, where Dr. Schnitzer carefully assesses their symptoms, medical history, and treatment goals. She emphasizes open communication and collaboration, ensuring that patients are fully involved in shaping their treatment plans. Follow-up visits typically last 30 minutes, during which she monitors progress, adjusts treatment as needed, and may recommend additional therapeutic support for comprehensive care.

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Why Talkiatry?

We’re a virtual mental health practice that makes it easy to find great care. We combine quality and convenience to help you thrive—faster. Our providers, like this one, are highly trained experts who specialize in medication management and collaborate with you on a treatment plan that fits your needs and comfort level.

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Christopher Zeoli, DNP, PMHNP, is a nationally board-certified Psychiatric Nurse Practitioner with over 20 years of certification and more than 30 years of experience in the psychiatric and mental health field. He earned his Doctor of Nursing Practice degree from Stony Brook University and has worked with patients across the lifespan in clinics, outpatient programs, hospitals, and private practices.

Christopher’s approach combines thoughtful medication management with supportive therapy. He is not only focused on addressing immediate concerns but also on guiding patients toward long-term well-being. Patients can expect a collaborative, compassionate, and goal-oriented partnership in their care.

Christopher values patient feedback as an essential part of treatment. He conducts careful evaluations, listens to each individual’s concerns, and tailors care to align with personal goals. By working together, he helps patients develop treatment plans that support both current needs and future growth.

Dr. Dennis Valerstain is a board-certified Adult and Child and Adolescent Psychiatrist. After completing his undergraduate education at Emory University, he attended medical school at the Northwestern University Feinberg School of Medicine. He subsequently completed psychiatry residency at University of Miami/Jackson Health System and further sub-specialized at University of Miami/Jackson Health System with a fellowship in Child and Adolescent Psychiatry. Dr. Valerstain has had the opportunity of working with a diverse array of patients including children, adolescents, the severely mentally ill, veterans, and cancer patients across three distinct hospital systems. Dr. Valerstain has had varied clinical experiences in specialty inpatient psychiatry units, emergency psychiatry, consultation liaison psychiatry, psycho-oncology, and outpatient clinics via telemedicine and face to face interactions. Dr. Valerstain has experience working with patients of all ages, particularly those with depression, anxiety, bipolar disorder, ADHD, Tic disorders, substance use disorders, and more. Dr. Valerstain's practice focuses on medication management and also employs empathic listening, supportive psychotherapy techniques, and a comprehensive and methodological approach to his visits. Given his broad and diverse training experiences, he enjoys problem solving and working collaboratively with patients (and their families) to navigate their complex issues and jointly focusing on simple solutions to work towards improving their mental health.

Dr. Jordan Kalosieh has experience treating patients across the lifespan in a variety of clinical settings, including inpatient, intensive outpatient, rehabilitation, and outpatient care. She earned her medical degree from St. George’s University School of Medicine and completed her psychiatry residency at HCA Aventura Hospital, where she served as chief resident.

Dr. Kalosieh believes in open and transparent communication, offering guidance while respecting each patient’s autonomy. She values authenticity in the therapeutic relationship, combining warmth with directness to create a calm, attentive, and nonjudgmental environment where patients feel supported and understood.

Dr. Kalosieh takes a holistic approach, carefully considering each patient’s unique history, needs, and goals when creating treatment plans. She emphasizes shared decision-making by clearly communicating her thought process and engaging patients as active partners throughout their treatment journey.

Dr. Sophie Weinberg is a compassionate and deeply dedicated physician, dually board-certified in Child, Adolescent, and Adult Psychiatry. Her journey through medicine has been shaped by rich and diverse training—completing her General Psychiatry residency at Maimonides Medical Center in Brooklyn, NY, and her fellowship in Child and Adolescent Psychiatry at Nassau University Medical Center in Long Island, NY.

Dr. Weinberg approaches healing as both a science and an art. Her care is profoundly patient-centered, collaborative, and holistic, honoring the intricate connection between body, mind, and spirit. She believes in the quiet power of nourishment, restful sleep, joyful movement, and meaningful connection as essential threads in the fabric of wellness.

With extensive experience in treating a wide spectrum of conditions—including mood disorders, anxiety, trauma, ADHD, and sleep disturbances—Dr. Weinberg tailors her approach to each individual’s unique story. She is a proud and affirming ally to the LGBTQIA community, creating a space where all identities are seen, respected, and supported.

Her treatment model includes thoughtful, personalized medication management, with generous 30-minute follow-up sessions to ensure care is never rushed and always attuned to the patient’s evolving needs. When appropriate, Dr. Weinberg may gently recommend the added support of a therapist, recognizing that healing is often a shared and layered journey.

With a heart rooted in empathy and a mind guided by clinical excellence, Dr. Weinberg walks beside her patients on the path to well-being—honoring their resilience and helping them rediscover their wholeness.

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