Mary Poupon, PMHNP

Dr. Michael Miller earned his medical degree with honors and completed his residency in Adult Psychiatry at the University of Kentucky College of Medicine. He has worked across a wide range of clinical settings, including inpatient, outpatient, community clinics, and state hospitals. Dr. Miller is also trained in multiple psychotherapy modalities, equipping him to meet diverse patient needs.

Dr. Miller values creating a safe and nonjudgmental space where patients can speak openly about their experiences and goals. He believes in a collaborative approach, working with patients to discover strategies that best suit their lives. He also takes into account lifestyle factors that may influence mental health, supporting a well-rounded and sustainable path to wellness.

Dr. Miller begins care with a comprehensive conversation about current concerns, past mental health, physical health, and life experiences. From there, he works with patients to create a personalized treatment plan—whether through therapy, medication, lifestyle adjustments, or a combination. Follow-ups focus on refining the plan to ensure it continues to support the patient’s journey.

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.

Roel Sepulveda is a board-certified psychiatric mental health nurse practitioner (PMHNP-BC) with a Master of Science in Nursing from the University of Alabama at Birmingham. Certified by the American Nurses Credentialing Center (ANCC), he has over 10 years of experience providing mental health care in psychiatric emergency rooms, outpatient psychiatry, and telehealth settings. Roel is committed to delivering comprehensive and accessible care that supports patients across diverse needs and backgrounds.

As a provider, Roel values creating a compassionate and collaborative environment where patients feel comfortable sharing their experiences. He takes a patient-centered approach, meeting individuals where they are and working together to identify treatment goals. Patients can expect a nonjudgmental space where their concerns are heard, respected, and addressed with empathy and understanding.

When working with patients, Roel begins by taking time to understand their history, symptoms, and current challenges. He develops individualized treatment plans that may include a combination of medication management, lifestyle strategies, and coordination with therapy or other supports. His goal is to provide evidence-based care while empowering patients to actively participate in their mental health journey and achieve lasting well-being.

Background  and credentials    

Dr. Christine Reyes is a bilingual Spanish-speaking adult psychiatrist with  25 years of experience. She completed her residency in Adult Psychiatry at  Saint Vincent's Hospital and Medical Center in New York City and subsequently  completed a Child Psychiatry fellowship at the University of Pennsylvania in  Philadelphia. Dr. Reyes has extensive experience practicing in outpatient and  community mental health settings.    

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Treatment approach    

Dr. Reyes provides compassionate psychiatric care using pharmacotherapy  combined with supportive psychotherapy. She specializes in treating anxiety,  depression, bipolar disorder, post-traumatic stress disorder (PTSD), and  numerous other psychiatric conditions. Additionally, Dr. Reyes emphasizes  nutritional counseling, assisting patients in achieving and maintaining a  healthy weight as part of their overall wellness plan.    

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What you can expect in a first visit    

Patients can expect a compassionate and thorough initial assessment aimed  at understanding their psychiatric symptoms, personal health goals, and  lifestyle considerations. Dr. Reyes combines medication evaluation with  supportive psychotherapy and may discuss nutritional guidance as part of a holistic  treatment plan. She prioritizes creating a supportive environment for  bilingual (English/Spanish) patients to openly discuss their mental health  concerns.    

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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.

Margaret Ngumi, MSN, APRN, FNP-C, PMHNP-BC, is a dual board-certified Psychiatric Mental Health and Family Nurse Practitioner with over 20 years of experience in healthcare. She began her career as a Family Nurse Practitioner and later pursued a post-master’s certification in psychiatry to address the growing need for accessible mental health services. Margaret has extensive experience in both inpatient and outpatient settings, treating conditions such as depression, anxiety, PTSD, mood disorders, and substance use disorders.

She takes a collaborative, patient-centered approach to care, creating a safe and supportive environment where individuals feel heard and empowered. With a strong emphasis on holistic care, Margaret considers all aspects of a patient’s well-being—including lifestyle, relationships, and overall health. Whether through medication management, therapy, or lifestyle modifications, she is committed to helping patients achieve meaningful and lasting improvements in their mental health.

Margaret begins with a comprehensive psychiatric evaluation to understand each patient’s history, concerns, and goals. She then works closely with them to develop a personalized care plan that may include medication, therapy, and evidence-based lifestyle interventions. She prioritizes open communication, patient education, and ongoing collaboration to ensure treatment remains effective and evolves with each patient’s needs. Through her compassionate and evidence-based approach, Margaret is dedicated to helping individuals find balance and improve their overall quality of life.

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Dr. Morales is a board-certified psychiatrist who is dedicated to the bio-psycho-sociocultural model. This has been reflected in Dr. Morales' pursuit of treating patients suffering from diverse medical and psychiatric conditions, respective psychological mindedness, and varied socio-economic and cultural backgrounds. As an individual, Dr. Morales is fascinated by the human mind, its mechanisms to pursue goals, and the cyclical patterns seen in maladaptation and suffering. He believes in understanding patients' experiences and developing comprehensive treatment plans towards reconciliation. After completing his medical education at the East Carolina Brody School of Medicine, as a Brody Scholar, he subsequently completed psychiatry residency at Jackson Health System/University of Miami. Dr. Morales has had the opportunity to work with a diverse array of patients including high-functioning patients, veterans, trafficking victims, the severely mentally ill of low socio-economic status, and cancer patients across three distinct hospital systems via telemedicine and face-to-face interactions. His experience includes working with patients suffering from post-traumatic stress disorder, adjustment disorder, mood disorders, generalized anxiety disorder, panic disorder, and more. He honors active listening, analytic understanding, supportive psychotherapy techniques, and evidence-based and methodological treatment for patient care and actualization. His goal is to assist patients in navigating short- and long-term goals as well as improved quality of life. As a result, Dr. Morales focuses on medication management, which is offered in conjunction with supportive therapy, which is offered in 1-hour initial and 30-minute follow-up visits. Dr. Morales believes that appropriate patients can benefit from additional exploratory and self-actualizing therapy from other valued and specialized therapists to support targeted goals. He will not hesitate to recommend and promote consultations with therapists for such patients who are ready to pursue. Ultimately, Dr. Morales seeks to understand, validate, and treat patients in a collaborative therapeutic alliance.