Margaret Ngumi, PMHNP

Dr. Megan Tusken is a board-certified adult psychiatrist. She received her undergraduate degree from Brown University and her medical doctorate at the University of Chicago Pritzker School of Medicine. Prior to joining Talkiatry, Dr. Tusken completed residency training in general psychiatry at the University of Texas Southwestern Medical Center. Dr. Tusken provides evidence-based, patient-centered care and considers a trusting doctor-patient relationship integral to helping her patients achieve their treatment goals. During training, Dr. Tusken gained extensive experience in inpatient, consult, emergency room, and outpatient practice settings with culturally and socioeconomically diverse patient populations. She also elected to acquire additional experience with specific patient populations, including patients with treatment-resistant depression, substance use disorders, and sleep disorders, as well as LGBTQ+ individuals and older adults. Tusken's treatment approach is collaborative and holistic. She provides medication management for a variety of mental health conditions, with particular interest in mood and anxiety disorders. In addition to psychopharmacologic interventions, she firmly believes in the mind-body connection, and she incorporates psychotherapeutic techniques into her visits to provide the best, individualized care for each patient.

Dr. Melody Stupey is a board-certified psychiatrist with over 26 years of experience treating adults in both inpatient and outpatient settings. She earned her medical degree from Oregon Health Sciences University and completed her residency at the University of Texas at San Antonio. Dr. Stupey is certified by the American Board of Psychiatry and Neurology.

Dr. Stupey believes in a collaborative approach to treatment, emphasizing active listening, compassion, and respect. She strives to create a warm, supportive environment where patients feel safe and empowered to speak openly without fear of judgment.

Her treatment process is holistic, considering physical, emotional, and lifestyle factors. She evaluates diet, physical activity, sleep habits, and thought patterns alongside medication needs. Dr. Stupey prioritizes using the lowest effective dose of medication to meet treatment goals while supporting the patient’s overall well-being.

Dr. Pressley Warrick is a double board-certified psychiatrist specializing in general psychiatry and child and adolescent psychiatry. Dr. Warrick currently practices full-time, offering comprehensive psychiatric care to children, adolescents, and adults. She previously established and led a Behavioral Health Clinic integrated within a Family Medicine Practice. Prior to this role, Dr. Warrick provided dedicated psychiatric care at a private psychiatry practice for over a decade.

Dr. Warrick earned her medical degree from the Medical University of South Carolina, completed residency training at Baylor College of Medicine's Menninger Department of Psychiatry and Behavioral Sciences, and pursued additional specialization through a Child and Adolescent Psychiatry fellowship at Palmetto Health/USC School of Medicine.

Known for a collaborative and holistic treatment approach, Dr. Warrick emphasizes individualized care and evidence-based practices to support patients’ mental wellness. Her professional excellence has earned recognition as Sumter’s Best Psychiatrist for consecutive years.

Dr. Warrick’s preferred treatment modalities include medication management, psychodynamic psychotherapy, and supportive psychotherapy. She specializes in treating depression, anxiety, ADHD, autism, OCD, bipolar disorder, and PTSD. Her typical approach for new patients involves taking a detailed patient history, establishing rapport, and setting clear treatment goals in partnership with her patients.

Dr. Juan Carlos Gonzalez is board-certified by the American Board of Psychiatry and Neurology and has 32 years of experience in treating adults. He completed his undergraduate education at Harvard University and earned his medical degree at Baylor College of Medicine in Houston, Texas. He completed his psychiatry residency training at Baylor College of Medicine, where he served as Chief Resident and subsquently was an Associate Professor of Psychiatry for ten years. During his tenure as a faculty member at Baylor, he served as Medical Director for the Baylor Psychiatry Clinic and also maintained a private practice, where he provided psychotherapy and medication management. 

In 2004, Dr. Gonzalez moved to Austin, Texas where he joined the US Veterans Administration, serving in various administrative positions, including Medical Director for the Central Texas VA Outpatient Clinics.

He provides compassionate, evidence-based care to thousands of service members, treating a broad spectrum of psychiatric conditions. Fluent in both English and Spanish, Dr. Gonzalez employs a humanistic approach to patient care, deeply understanding how patients’ past experiences affect their present.

Dr. Gonzalez provides compassionate, humanistic care, recognizing how past experiences shape the present. His treatment integrates medication management with psychoanalytic, cognitive-behavioral, and supportive psychotherapy.

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Mu Xu, MD is a Psychiatrist at Talkiatry. He obtained his medical doctorate degree from the University of Chicago Pritzker School of Medicine and PhD from New York University. He completed his psychiatry residency at New York University. Dr Xu is licensed to practice in California, New York, New Jersey, Connecticut, Pennsylvania, and Maryland. Dr. Xu provides both medication management for a variety of psychiatric conditions. Dr. Xu is fluent in English and Mandarin. Dr. Xu is a general adult psychiatrist specializing in medication management. He values building strong connections with patients from all walks of life and tailoring treatments to their unique needs. His working style is characterized by attentive listening, detailed follow-up questions, and straightforward communication, fostering a collaborative and empathetic environment.

Education and training

Stony Brook University (Bachelor of Science)

American University of Integrative Sciences (MD)

Davenport University (MBA)

Bergen New Bridge Medical Center (residency)

University Hospitals Cleveland Medical Center/Case Western Reserve University (fellowship)

Dr. Mohammed Islam is board certified in both General Psychiatry and Child and Adolescent Psychiatry. He completed his undergraduate studies at Stony Brook University and attended medical school at the American University of Integrative Sciences. He completed his psychiatry residency training at Bergen New Bridge Medical Center followed by completion of a fellowship in Child and Adolescent Psychiatry at University Hospitals/Case Western Reserve University where he served as Chief Fellow. Prior to joining Talkiatry, he has trained/worked in a combination of various healthcare systems across New York, New Jersey, Ohio and Kentucky.

Dr. Islam treats patients of various ages- in addition to medication management he is a strong proponent of therapy in various forms. His approach to the treatment of adults and children/adolescents incorporates the impact of various things such as family history of mental health/medical conditions as well as any adverse childhood experiences/trauma. In addition to screening for common conditions such as bipolar disorder, anxiety and depression in all patients, he also emphasizes the importance of screening for conditions that can manifest in childhood (such as ADHD, Autism) as well as first-episode psychosis in young adults.

From the initial visit and onward, Dr. Islam prioritizes a collaborative effort with his patients (and at times their families). In addition to medication adjustments, he emphasizes the importance of optimizing additional tools such as therapy while making appropriate lifestyle changes. During every follow up visit, he takes care to ensure that the current treatment is not hindering his patient’s progress in any way.

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