Christa DeFries, MD

Dr. Zeynep Altun is board-certified in Psychiatry and holds a Ph.D. in Neuroscience. Dr. Altun graduated cum laude from Istanbul University, Istanbul Medical School. She completed her residency training in Neurology and is Turkish board-certified in clinical Neurology. Subsequently, she moved to the U.S. and finished her Ph.D. in cellular Neuroscience at Cornell University Graduate School of Medical Sciences. Dr. Altun completed her psychiatry residency training at Albert Einstein College of Medicine, Department of Psychiatry and after, her clinical fellowship in Comprehensive Psychiatric Emergency Program at Columbia University Medical College, New York Presbyterian Hospital. Dr. Altun has practiced in various settings including Bellevue Hospital, New York Presbyterian Hospital, Columbia Doctors Faculty Practice Office, Mount Sinai West and Mount Sinai Morningside Hospitals. Dr. Altun has held various academic appointments at New York University School of Medicine Department of Psychiatry; New York Presbyterian Hospital-Columbia University Medical College Department of Psychiatry; New York State Psychiatric Institute and Mount Sinai School of Medicine Department of Psychiatry. She spent most of her professional career supervising and teaching medical students, psychiatry residents and nurse practitioners. As an adult psychiatrist, Dr. Altun has extensive theoretical knowledge of the nervous system and its disorders and more than 10 years of experience in treating various mental illnesses including mood disorders, anxiety disorders, psychotic disorders, autism-spectrum and neuropsychiatric disorders, psychiatric emergencies and crisis management as well as cognitive behavioral and supportive psychotherapy. In Columbia Doctors, she collaborated closely with the Lieber Recovery Clinic, treating young adults with various mental illnesses. The philosophy of her practice is to collaborate with patients and work together with them so that they can lead symptom-free, productive, and stable lives.

Dr. Osamudiamen Osa-Edoh is board-certified in general adult psychiatry. He earned his medical degree from the University of Benin in Nigeria and completed his psychiatry residency at Meharry Medical College in Nashville, Tennessee, where he served as Chief Resident and received multiple honors. He previously served as Medical Director at Sumner Regional Hospital and Assistant Professor at Meharry Medical College.

As a psychiatrist, Dr. Osa-Edoh diagnoses and treats mental illnesses through medication management and psychotherapy. He believes in a kind, compassionate, and evidence-based approach that prioritizes patient needs and fosters a supportive, healing environment.

Dr. Osa-Edoh creates a welcoming, collaborative space where patients feel heard and supported. He takes time to listen, building trust and a strong therapeutic relationship. His goal is to partner with each patient to support their mental health and help them reach their personal wellness goals.

Dr. Zaidi graduated residency from University Hospitals/Case Western Reserve University in 2015. After residency he worked at the Michael E. DeBakey VA Medical Center as a staff psychiatrist. He eventually took on the role of Mental Health Lead Psychiatrist and Interim Clinic Director at the Tomball VA Outpatient Clinic. Dr. Zaidi then transferred to a telepsychiatry role at VISN 15 providing mental health coverage for rural areas in Kansas, Missouri, and Illinois. Dr. Zaidi resides in Houston, Texas and enjoys spending time with his family, being outdoors, and watching/playing sports such as Football, Basketball, and Soccer.

Dr. Zaidi has over 15 years of experience in treating different mental health conditions and is currently board certified by the American Board of Psychiatry and Neurology. He enjoys getting to learn about patients and working collaboratively to provide the best treatment possible, be it medications or talk therapy. Dr. Zaidi has vast experience treating Major Depressive Disorder, Bipolar Disorder, PTSD, among many others.

Dr. Zaidi's goal when working with patients is to not come to a generic diagnosis; rather, it is to get to know about the client and try and manage their symptoms in the best way possible. Overall, the process is collaborative, and both parties need to be comfortable with the decisions moving forward.

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Dr. Stephen Geisler is a board-certified adult psychiatrist and has been practicing for over 37 years. His practice focuses on medication management, and typically offers this in conjunction with supportive therapy in 30-minute follow-up visits. If Dr. Geisler feels you would benefit from working with a therapist in conjunction with medication management, he welcomes collaboration with your therapist to make for the best outcome. Dr. Geisler is a graduate of the New York University School of Medicine. He completed a fellowship in Psychoanalytic Psychotherapy at the Zucker Hillside Hospital of Northwell Health after finishing his residency training there. He is currently an Assistant Clinical Professor at the Donald and Barbara Zucker School of Medicine at Hofstra/Northwell. Over the years Dr. Geisler has received a number of awards including NAMI Exemplary Psychiatrist Award, The APA Irma Bland Certificate of Excellence in Teaching Residents, the Zucker Hillside Hospital Department of Psychiatry Recognition Award for Education, and twice received the Outstanding Teacher of the Year Award from the graduating residents' class. Dr. Geisler is a member of the American Psychiatric Association, the Nassau Suffolk District Branch of the APA and the American Society of Clinical Psychopharmacology. Through the years, Dr. Geisler has participated in many clinical research projects, has been the co-author of many papers, and has made many presentations. Dr. Geisler specializes in psychopharmacology, especially tailoring individualized treatment to serve the needs of patients with a variety of conditions. He has a lot of experience in treating patients with depression, bipolar disorder, anxiety disorders, ADHD, and OCD.

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. Lisette Rodriguez-Cabezas earned her medical degree from the University of Illinois at Chicago and completed her psychiatry residency and a Women’s Mental Health Fellowship at Northwestern University. She has been Board Certified in adult psychiatry since 2017 and is a Distinguished Fellow of the American Psychiatric Association. With over 10 years of experience, she specializes in Women’s Reproductive Mental Health.

Dr. Rodriguez-Cabezas values a patient-centered approach, emphasizing open communication and creating a supportive environment where patients feel heard and understood.

She begins by gathering a detailed history from each patient to fully understand their goals and concerns. From there, she develops an individualized treatment plan tailored to the patient’s unique needs, ensuring care is collaborative and focused on achieving meaningful outcomes.