Xiomara Nieves-Alvarado, MD

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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Essence Jackson-Jones is a Professional Counselor and Art Therapist with extensive experience supporting teens, college students, and young adults navigating life transitions, anxiety, and mood-related concerns. She earned her Art Therapy and Mental Health Counseling degree from the School of the Art Institute of Chicago and has practiced in outpatient, intensive outpatient, and community-based settings. Essence integrates creative and evidence-based approaches to promote emotional well-being, self-awareness, and personal growth, combining her background in counseling and the arts to help individuals connect with their inner strengths and cultivate balance through insight, creativity, and intentional growth.

Essence believes that meaningful healing begins when clients feel heard, respected, and empowered. She creates a warm, collaborative, and authentic environment where clients can explore their experiences safely. Guided by compassion, curiosity, and cultural sensitivity, she tailors each session to meet clients where they are while encouraging resilience, self-expression, and the development of coping skills that foster long-term emotional well-being. Art making in session is encouraged as an invitation rather than an expectation.

Essence begins by learning each client’s unique story, background, and goals during the initial sessions. She collaborates with clients to develop individualized treatment plans that reflect their needs and strengths. Her therapeutic process integrates dialectical behavior therapy (DBT), cognitive-behavioral strategies (CBT), and creative expression to deepen insight and emotional regulation. Essence’s person-centered, strengths-based approach helps clients move toward greater clarity, connection, and fulfillment.

Dr. Jenna Hartman is double board certified in General Psychiatry and Addiction Psychiatry. Dr. Hartman graduated from Tufts University before completing medical school at New York Institute of Technology College of Osteopathic Medicine. She then completed residency at Maimonides Medical Center, where she was a Chief Resident, and then pursued an addiction psychiatry fellowship at Mount Sinai Beth Israel. Dr. Hartman was also trained in psychodynamic psychotherapy by the Psychoanalytic Association of NY. Following her training, Dr. Hartman returned to Maimonides Medical Center, where she worked as an attending adult outpatient clinic, treating patients from many different backgrounds with a wide array of diagnoses. She holds a special interest in treating mood disorders, anxiety disorders, and OCD. Dr. Hartman uses a compassionate and thoughtful approach in order to form a collaborative partnership with her patients. She believes in treating the person as a whole and tailoring treatments to each individual's specific needs. Dr. Hartman works with patients in 30 30-minute follow up sessions, where in addition to medication management she provides supportive and at times psychodynamic therapeutic techniques.

Dr. Sabrina Ghim is a board-certified physician specializing in adult psychiatry and practices adult psychiatric medication management. She focuses on building a strong therapeutic and collaborative environment with patients. She works with individuals struggling with depression, ADHD, obsessive compulsive disorder, anxiety disorders, including generalized anxiety, and social anxiety. Dr. Ghim usually meets with patients monthly for psychiatric follow up appointments. She provides psychiatric medication management in a comprehensive manner, paying careful attention to each patient's unique biological, psychological, and cultural make-up. She is diligent about keeping up-to-date on the research and expanding frontiers of psychiatry and psychopharmacology. She strongly believes in tailoring treatment in an integrative and collaborative manner to provide the best outcome for each unique patient. In some instances, Dr. Ghim may recommend the addition of a separate therapist in order to help facilitate the best care possible. Dr. Ghim experienced various cultures growing up in different countries and environments, shaping her open-minded demeanor and views, and eventually her interest in the human mind and psychiatry. She earned her bachelor's degree in Molecular Biology with honors, and a Doctor of Medicine (M.D.) degree from the University of Central Florida College of Medicine. She completed her Adult Psychiatric Internship and Residency training in New York City, at the Mount Sinai Morningside and West Hospitals, where she treated a diverse patient population with psychiatric illnesses in emergency, inpatient, and outpatient settings. Dr. Ghim is currently licensed in and seeing patients located in the states of New York, Florida, and Texas for medication management.

Dr. John's practice focuses on medication management, offered in conjunction with emotionally focused therapy in 30-minute follow-up visits. Occasionally, Dr. John may believe that additional therapy is also needed and ask that you bring a therapist into your care team to provide the best outcome. Dr. John strongly believes in a compassionate, collaborative approach and will provide psychoeducation to help patients make informed decisions and achieve their treatment goals.

Brittney is a Licensed Mental Health Counselor in the State of New York. She attended SUNY Buffalo where she obtained a Bachelor's in Psychology and a Master's in Education with a Certificate of Advanced Study in School Counseling and a Certificate of Advanced Study in Mental Health Counseling. Brittney started her career as a School Counselor before transitioning full-time to Mental Health Counselor. Brittney is an empathetic and open-minded clinician, striving to meet her clients where they are, build trust, and maintain a safe, non-judgmental environment. She is experienced and passionate about working with teens and adults with various forms of trauma. Additionally, Brittney utilizes SPACE (Supportive Parenting for Anxious Childhood Emotions) for families impacted by anxiety and OCD to help them understand the impact these experiences have on their lives, ultimately finding the resolutions and outcomes they hope for. While EMDR therapy is her primary treatment approach for individuals, or SPACE for families, she also utilizes ACT, Parts Work, Motivational Interviewing, CBT, and others.