Tetyana Tarnavsky, MD

Dr. Meghan Fahy Hebishi is double-board certified in General Psychiatry and Child and Adolescent Psychiatry. Originally from Delaware, Dr. Hebishi earned her medical degree from the Philadelphia College of Osteopathic Medicine in 2017. She also obtained a Master of Science in Biological Sciences from Drexel University and a Bachelor of Science in Biology from Juniata College. In 2017, Dr. Hebishi moved south and is happy to call North Carolina her home. She completed her internship at Campbell University/Harnett Health in 2018. She went on to complete a General Psychiatry Residency followed by a Fellowship in Child and Adolescent Psychiatry at East Carolina University Brody School of Medicine. Prior to joining Talkiatry in 2025, Dr. Hebishi was in private practice at North Raleigh Psychiatry in Raleigh, NC.

Dr. Hebishi is experienced in treating children, adolescents and adults. She utilizes medication management and psychotherapy in her clinical practice. Her areas of interest include ADHD across the lifespan, anxiety disorders, mood disorders (depression and bipolar disorder) and OCD. She is dedicated to building a collaborative relationship with patients and their families where shared-decision making is respected and encouraged. She is passionate about providing continuity of care to her patients as they navigate life's changes and challenges.

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. Alejandra Vivas is board-certified in adult psychiatry and board-eligible in child and adolescent psychiatry. She completed her general psychiatry residency at Montefiore Medical Center and a child and adolescent fellowship at Mount Sinai School of Medicine. Dr. Vivas brings extensive experience from outpatient, emergency, and telepsychiatry settings. She has advanced training in CBT, Motivational Interviewing, and Psychodynamic Therapy. Fluent in English and Spanish, she is committed to culturally sensitive, individualized care.

Dr. Vivas fosters a warm, respectful, and professional space where patients feel seen and empowered. She values open communication and builds collaborative relationships to align treatment with each person’s values, goals, and lifestyle. Her approach is integrative and flexible, grounded in evidence-based methods to support lasting, meaningful change.

Dr. Vivas begins with a thorough evaluation to understand each patient’s history and goals. She creates customized treatment plans that may include therapy, medication, or both. Drawing on CBT, Motivational Interviewing, and Psychodynamic Therapy, she adapts care to meet evolving needs, aiming to relieve symptoms, foster resilience, and support long-term well-being.

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Barb VanHouten, LCSW, provides a safe, non-judgmental atmosphere where clients feel heard and supported. She brings a wealth of personal and professional experiences that have shaped her insight, knowledge, and empathy, enabling her to walk alongside others during their most difficult times. Barb believes that everyone has a story, and that life’s challenges can sometimes become overwhelming, leading to feelings of hopelessness, helplessness, and despair.

Barb specializes in treating a wide range of concerns, including anxiety, depression, anger management, addiction, bipolar disorder, antisocial behaviors, family relationships, grief and bereavement, life transitions, job and employment issues, medical and physical health concerns, PTSD, somatic symptom disorders, learning disorders, stress, and trauma. Her goal is to create a therapeutic space where clients feel empowered to explore challenges and build resilience.

Barb uses a variety of evidence-based approaches tailored to each individual’s needs. Her methods include Cognitive Behavioral Therapy (CBT), Motivational Therapy, Solution-Focused Brief Therapy, Emotionally Focused Therapy, Mindfulness, Family Systems, Acceptance and Commitment Therapy (ACT), Trauma-Informed Care, Behavioral Modification, Internal Family Systems, Strength-Based approaches, and Dialectical Behavioral Therapy (DBT). She collaborates with clients to develop practical, effective solutions for growth and healing.

Dr. Garrick Gaffney is board certified in psychiatry by the American Board of Psychiatry and Neurology (ABPN). He earned his medical degree from Kansas City University and completed his psychiatry residency at John Peter Smith Hospital in Fort Worth, Texas. A combat veteran, he served in the U.S. Marine Corps, including a tour in Iraq, and was honored with the Navy and Marine Corps Achievement Medal and a Certificate of Commendation for exemplary leadership.

During medical school, Dr. Gaffney pursued advanced training as an Osteopathic Manipulative Medicine fellow. As a resident, he served as Chief Academic Resident and earned accolades such as Intern of the Year and Outstanding Educator of the Year twice consecutively.

Dr. Gaffney specializes in treating complex psychiatric conditions, including depression, anxiety, PTSD, OCD, bipolar disorder, and insomnia. He has presented case studies and quality improvement projects at national conferences, including the American Psychiatric Association (APA), Academy of Consultation-Liaison Psychiatry, and Association for Academic Psychiatry.

A proponent of holistic care, Dr. Gaffney integrates psychotherapy into medication management and emphasizes lifestyle modifications and evidence‑based integrative medicine.

New patients receive comprehensive evaluations to rule out medical causes of symptoms, followed by tailored treatment plans combining therapy, medication, and lifestyle adjustments. Follow‑up visits focus on symptom management through supportive, brief dynamic, or cognitive behavioral therapy, with frequent appointments until stabilization is achieved.

Dr. Gaffney is committed to collaborative, patient‑centered care that addresses both mental and physical well‑being.

Getting to know me...
Dr. David Weber is a highly experienced psychiatrist and medical doctor with dual specialties in psychiatry and primary care medicine. His comprehensive approach integrates both disciplines, allowing him to address mental health concerns with a deep understanding of their medical and psychological aspects.

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Dr. Weber earned his Doctor of Medicine (MD) from Southern Illinois University School of Medicine and pursued advanced training at Walter Reed Army Medical Center, Harvard University, and Georgetown University Medical Center. He is Board-Certified in General Psychiatry and Fellowship-Trained in Forensic Psychiatry and Occupational Medicine, equipping him with the expertise to diagnose and treat a broad spectrum of mental health conditions, considering both medical and psychiatric factors.

What should a new patient know about working with you?
Believing that each patient is more than a diagnosis, Dr. Weber takes a personalized approach, collaborating closely with individuals to develop tailored treatment plans. He views himself as an advisor and facilitator, empowering patients to take charge of their recovery.

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Areas of Focus:
ADHD (Focus & Cognitive Function)
Anxiety & Depression (Mood, Sleep, & Energy Concerns)
Stress & Brain Fog (Cognitive & Emotional Well-Being)

What is your typical process for working with patients?
Dr. Weber is an experienced, compassionate, and dedicated advocate for his patients' mental and physical health. He strongly believes in a collaborative, patient-centered approach to treatment, helping individuals achieve their personal and professional goals.
Committed to a well-balanced life, Dr. Weber is married and has two married daughters, two grandsons and three dogs. His wife, a clinical psychologist, helps ground his therapeutic approach, emphasizing the importance of integrating therapy with medication to enhance overall well-being. Guided by the ethos, "Treat them like you would your own family," he is dedicated to providing compassionate, high-quality care.