Margaret Ngumi, PMHNP

Dr. Sallie Jo Hadley holds the position of Staff Psychiatrist at Talkiatry. She is board-certified in psychiatry and pediatrics and is board-eligible in child and adolescent psychiatry. She has been practicing for 22 years. Dr. Hadley's practice is focused on medication management with supportive therapy in follow-up sessions of 15 or 30 minutes. Dr. Hadley is experienced with collaborative treatment and encourages adding a therapist to your care team in those situations where additional therapy might be helpful. Dr. Hadley is a graduate of the Mount Sinai School of Medicine's triple-board program (psychiatry, pediatrics, and child and adolescent psychiatry). She completed post-doctoral research fellowships at Mount Sinai's Seaver Center for Autism Research/Compulsive-Impulsive Anxiety Disorders and at Columbia University's New York State Psychiatric Institute, the latter focusing on metabolic and weight issues in children and adolescents with psychiatric disorders. Dr. Hadley had an early background as a nurse, receiving her B.S. in Nursing from the University of North Carolina-Chapel Hill. Her experience in neonatal, psychiatric, and hospice nursing led her to pursue her degree in medicine. Dr. Hadley has worked in pharmacologic research in both academic and industry settings. Prior to joining Talkiatry, she practiced in a multi-specialty clinic for individuals and families dealing with autism or intellectual disabilities and complex medical co-morbidities. Dr. Hadley enjoys working with motivated individuals of all ages who are seeking to better their life or better cope with life circumstances. She has particular expertise in working with individuals and their families suffering from anxiety, depression, and obsessive-compulsive disorders.

Megan O’Brien is a board-certified Psychiatric Mental Health Nurse Practitioner (PMHNP) with experience in inpatient, outpatient, and emergency mental health settings. She earned her NP degree from UCSF, the top-ranked program in the country at the time. In addition to clinical work, she enjoys teaching and is passionate about training the next generation of compassionate psychiatric nurse practitioners.

Megan believes in meeting patients where they are, offering empathy, respect, and acceptance. She values open communication and sees treatment as a collaborative process. Her approach empowers patients to take the lead in their care while she supports them as a partner and guide along the way.

Megan begins by listening carefully to each patient’s story and asking relevant questions to understand their needs. Together, she and the patient build a tailored treatment plan that aligns with their goals. Her focus is on reducing mental health symptoms and helping people experience greater freedom and flexibility in their lives.

Dr. Clark is a board-certified adult psychiatrist. She is fellowship-trained in Child and Adolescent Psychiatry and has been in practice for 11 years. She received her medical degree from the Medical University of South Carolina. Dr. Clark then completed her residency training and continued her training in child and adolescent fellowship at the Medical College of Georgia. Dr. Clark works with patients to create an environment where they feel comfortable and supported. She focuses on medication management along with supportive therapy. Normally visits are 30-minute follow-ups that allow time to focus on areas of support needed. If additional therapy is recommended, she will request a therapist be added to your care team to meet all your needs. Dr. Clark has worked in both inpatient and outpatient settings with adult, child, and adolescent populations. She has worked in private practice as well as community mental health, where she worked with reaching under-served communities. Dr Clark has a passion for treating both adult and child and adolescent patients with anxiety and depression.

Dr. Megan Wynne is board certified in adult psychiatry and completed fellowship training in Consultation-Liaison Psychiatry (Psychosomatic Medicine). She has been in practicing psychiatry since 2006. Dr. Wynne completed her medical degree at Drexel University School of Medicine in Philadelphia, PA, her psychiatric residency at Thomas Jefferson University Hospital in Philadelphia, PA and her consultation/liaison psychiatric fellowship at Long Island Jewish Hospital in Queens, NY. She continued to work in Consultation Liaison Psychiatry at North Shore Hospital in NY, before working for nine years at Philadelphia Veterans Administration Hospital as a staff psychiatrist and associate at the University of Pennsylvania University Hospital. During this time, she worked closely with patients struggling with Traumatic Brain Injury, Post Traumatic Stress Disorder, Depression and Anxiety. She acted as an attending psychiatrist in training medical students, psychiatric residents and fellows. Following a move to New Zealand, she worked as lead psychiatrist for Te Puna Waiora, Maori Mental Health team (Indigenous Person mental health clinic) at Counties Manakau District Health Board. She worked with multiple patients facing cultural challenges, as well as psychosocial stressors (poverty, family fragmentation, poor education). During this time, she worked within the indigenous system of mental health, which treats not just emotional or physical issues for a person, but spiritual and familial as well. She has incorporated this into her treatment approach for all patients. Dr. Wynne has always believed that medication must be used in conjunction with psychodynamic therapy, and medical and social supports to most appropriately treat a patient. She offers 30-minute sessions consisting of medication management and brief therapeutic support. She specializes in treating victims of trauma, medical comorbidity.

Dr. Varsha Narasimhan is a physician with experience working in outpatient integrated medical settings, where she has collaborated closely with primary care and obstetric providers to support patients’ mental health within the context of their overall health. She earned her medical degree from SUNY Downstate Medical Center and completed her psychiatry residency and integrated care fellowship at Montefiore Medical Center. Dr. Narasimhan also holds additional training in bioethics and medical humanities, which informs her thoughtful and reflective approach to care.

Dr. Narasimhan’s style is practical, respectful, and grounded in shared decision-making. She works collaboratively with patients to ensure they feel informed and empowered in their care. She treats depression, anxiety, PTSD, ADHD, bipolar disorder, and cognitive concerns, with a focus on patient-centered care and careful, individualized medication management.

Dr. Narasimhan tailors treatment to each patient’s unique concerns, values, and goals. She prioritizes compassion and a whole-person perspective during the initial assessment and throughout treatment, working with patients to develop plans that support both mental health and overall well-being.

Dr. Taj Deen earned his medical degree from Dow Medical College in Karachi, Pakistan, and completed psychiatry residency training at Maimonides Medical Center in Brooklyn. He has over 20 years of experience at Jacobi Medical Center’s acute inpatient psychiatric unit, led an acute psychiatric unit for 10 years at Montrose VA Hospital in New York, and served for 25 years in the psychiatric emergency room at Westchester Medical Center.  

Dr. Deen prioritizes building a genuine therapeutic alliance with all patients, fostering open communication and collaboration. He works closely with patients to set clear treatment goals and objectives while creating a warm, supportive environment in which patients feel heard, respected, and empowered.  

Dr. Deen begins with a comprehensive interview to understand each patient’s history, concerns, and goals. From there, he develops individualized treatment plans tailored to the patient’s objectives, combining compassionate guidance with evidence-based psychiatric care to support meaningful progress.