Merna Guirguis, MD

Dr. Onah Uwagbai is a board-certified psychiatrist who earned her medical degree from St. George’s University School of Medicine. She completed her psychiatry residency at the University of Kansas Medical Center, where she served as Chief Resident at the Kansas City VA hospital and was recognized for Excellence in Scholarship. Most recently, she worked at the North Texas VA Healthcare System, caring for individuals with treatment-resistant depression and complex psychiatric needs.

Dr. Uwagbai has a passion for supporting individuals with mood disorders, anxiety, trauma, and women’s mental health. She believes healing is best achieved through compassion, collaboration, and respect. Patients can expect a warm, supportive environment where they feel heard and understood, with treatment tailored to their unique history and goals.

Dr. Uwagbai begins with a comprehensive evaluation to understand each patient’s needs and then develops an individualized treatment plan. She draws on evidence-based practices, including expertise in complex cases, and may incorporate both therapy and medication management. Her goal is to empower patients to take an active role in their care while fostering resilience, stability, and long-term wellness.

Background  and credentials    

Dr. Columban Heo is a board-certified psychiatrist. He earned his medical  degree from Touro University Nevada and completed his residency at Unity  Health White County Medical Center. Dr. Heo further specialized by completing  a fellowship in Consultation-Liaison Psychiatry at the Cleveland Clinic,  where he gained extensive experience working within multidisciplinary  healthcare teams, particularly focused on psychiatric care for patients with  complex medical conditions.    

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Treatment approach  

Dr. Heo specializes in treating a broad range of psychiatric conditions,  notably mood and anxiety disorders. He integrates medication management with  a holistic, personalized approach to treatment, emphasizing the  interconnectedness of mind, body, and spirit. Dr. Heo believes in tailoring  treatment plans individually, combining therapy and medications to suit each  patient’s unique needs, and highlights the importance of healthy  relationships in achieving overall mental health.    

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What you can expect in a first visit    

Patients visiting Dr. Heo for the first time can expect a comprehensive and  personalized assessment that explores not just their psychiatric symptoms but  their overall well-being and personal relationships. Dr. Heo prioritizes a  holistic evaluation, carefully balancing medication considerations and  therapeutic interventions tailored specifically to each patient’s situation  and goals. He creates an empathetic, collaborative atmosphere to discuss and  develop personalized plans for mental and emotional wellness.  

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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.

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.

Daniel Ebert, MD, earned his medical degree from Vanderbilt University School of Medicine and completed his psychiatry residency at Massachusetts General Hospital and McLean Hospital. He has served on the faculty at Harvard Medical School and Johns Hopkins School of Medicine for over 15 years. Board certified in psychiatry by the American College of Psychiatry and Neurology, Dr. Ebert has extensive experience treating mood, anxiety, psychotic, and substance use disorders across inpatient and outpatient settings, including student mental health, community psychiatry, and academic outpatient practices.

Dr. Ebert strives to create a respectful environment where patients feel heard as they build a strong therapeutic alliance. He values long-term collaboration to achieve meaningful treatment goals and improve quality of life. With clinical experience guiding his approach, he offers reasonable therapeutic optimism while addressing challenging symptoms and issues.

Dr. Ebert begins with a comprehensive clinical assessment to understand each patient’s symptoms, life story, behavior, and personality. He develops a collaborative treatment plan, revisiting it over time. Follow-up appointments integrate medication management, if prescribed, and psychotherapy tailored to the individual, using a combination of standard therapeutic approaches aligned with the shared plan.

Dr. Mullenix is a board-certified adult psychiatrist who strives to form strong therapeutic and collaborative environments with patients and values patient empowerment. Dr. Mullenix received his medical degree from the Chicago Medical School and then went on to complete his residency in psychiatry at Advocate Lutheran General Hospital. His interests and expertise are in helping patients struggling with depression, anxiety, including social/obsessive compulsive and generalized anxiety disorders, and ADHD. He provides psychiatric medication management along with supportive, cognitive behavioral therapy (CBT) and other modalities of therapeutic treatment. Dr. Mullenix's practice focuses primarily on medication management, or pharmacotherapy. He routinely incorporates supportive therapy into his 30-minute follow-up visits. Dr. Mullenix may occasionally recommend that a therapist be part of the care team to provide optimal outcomes. The philosophy of his practice is to actively involve patients in the decision-making process to improve adherence to treatment and build trusting relationships with all patients.

Dr. Peter Szeibel is board certified in adult psychiatry and has been practicing for over 36 years. His practice has focused primarily on medication management within the context of a supportive psychotherapeutic relationship. He also utilizes cognitive behavioral techniques. If the patient requires more intensive psychotherapy, Dr. Szeibel refers the patient to a therapist and collaborates with the therapist. Dr. Szeibel has experience in treating Depressive Disorders, PTSD, Panic Disorder, OCD, Bipolar Disorder, ADHD, and many other conditions. He feels his personal strengths include his inquisitiveness, scientific curiosity, and his desire to understand his patients better. Dr. Szeibel was born in Hungary, just a few months before the Hungarian Revolution against the Soviets broke out in 1956. He and his family fled under difficult circumstances and immigrated to the United States. Dr. Szeibel grew up in New York City. He attended The Bronx High School of Science, followed by Columbia University for his B.A., where he took a double major in chemistry and music. After obtaining his M.D. from S.U.N.Y in Syracuse, he returned to New York City for residency and fellowship training. During this time he won the Bendheim Fellowship Award at Cohen Children's Medical Center for his research study which examined the effects of background music on the academic performance of children with ADHD. His current areas of interest include adult ADHD, psychiatric and medical co-morbidities, and the LGBTQ population.