Mu Xu, MD

Dr. Fang is a board-certified psychiatrist who completed his psychiatry residency at Duke University, where he received extensive training in Psychopharmacology, Psychotherapy (“Talk Therapy”), Transcranial Magnetic Stimulation (TMS), and Electroconvulsive Therapy (ECT). Throughout his life, Dr. Fang has lived in various places such as China, Canada, Upstate New York, Maine, and North Carolina, where he currently resides. This rich cultural experience allows him to connect with individuals from diverse backgrounds, which is crucial in the field of psychiatry where treatment is so highly personal. Dr. Fang has also practiced in multiple settings including a college mental health clinic, an adult ADHD clinic, a perinatal psychiatry clinic, a VA hospital, and a residential recovery program.

While Dr. Fang’s current practice is primarily focused on medication treatment, he utilizes his training as a therapist to ensure that patients feel understood and empowered to discuss any other issues they might be facing. With experience in many modalities of therapy including Psychodynamic, Supportive, Cognitive Behavioral Therapy (CBT), and Acceptance and Commitment Therapy (ACT), Dr. Fang knows that one size does NOT always fit all. If more in-depth therapy is felt to be beneficial, Dr. Fang may refer clients to a separate therapist.

Dr. Jacob T. Kannarkat is an adult psychiatrist. Dr. Kannarkat's practice focuses on medication management. In his visits, he uses an integrative approach, blending an empathic, problem-solving orientation with an understanding that the reasons for an individual's condition can be complex. He has experience dealing with many forms of mental illness and works collaboratively with his patients and their other treatment providers in making a plan for recovery. Dr. Kannarkat completed undergraduate studies at the University of Florida. After receiving his medical degree at the University of Miami Miller School of Medicine, Dr. Kannarkat continued for residency at the University of Miami/Jackson Health System. He ultimately completed his training as Chief of Psychiatric Emergency Services at Yale School of Medicine. Dr. Kannarkat has experience working with adults of all ages who are dealing with depression, anxiety, bipolar disorder, PTSD, substance use disorders, and many other conditions.‍

Dr. Kira Posteraro is double board-certified in Adult and Addiction Psychiatry and has over 10 years of clinical experience. She completed her General Adult Psychiatry Residency at Allegheny General Hospital in Pittsburgh, PA, followed by a fellowship in Addiction Psychiatry at Beth Israel Medical Center in New York, NY.

Dr. Posteraro’s career has included serving as Director of Psychiatric Services at an addiction treatment center in Pittsburgh, PA, where she provided care across the full continuum of substance use disorder treatment—including residential, acute PHP, IOP, outpatient, and aftercare services. She later held the role of Section Chief Psychiatrist for the Center for Treatment of Addictive Disorders at VA Pittsburgh Healthcare System, offering both residential and outpatient services and acting as Medical Director for the SAMHSA-certified Opioid Treatment Program. Most recently, she served as Chief of Psychiatry for the Behavioral Health Service Line at VA Pittsburgh, where she had the honor of caring for our nation’s Veterans.

While her clinical expertise centers on the diagnosis and treatment of substance use disorders, Dr. Posteraro also has extensive experience treating a wide range of psychiatric conditions, including depressive and bipolar spectrum disorders, anxiety disorders, and trauma-related disorders.

Dr. Posteraro uses a collaborative, supportive approach to care, incorporating motivational interviewing to help guide patients on their journey to wellness. She integrates holistic strategies alongside medication management and is dedicated to meeting patients where they are in treatment to build individualized, effective recovery plans.

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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.

Background and credentials

Dr. Vansickle is a board-certified adult psychiatrist with over 25 years of clinical experience. She earned her medical degree from the University of Texas Health Sciences Center San Antonio and completed her internship at UAB. She then completed her psychiatry residency at the University of Louisville Hospital, where she served as chief resident and received a national award in community psychiatry. Throughout her career, she has worked in both inpatient and outpatient settings as a staff psychiatrist, primarily in Texas and Alabama.

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Treatment approach

Dr. Vansickle places a strong emphasis on establishing trust and building therapeutic relationships to help patients achieve their goals. Her practice focuses on medication management, often combined with supportive or emotionally focused therapy during 30-minute follow-up visits. If she believes additional therapy would be beneficial, she may recommend that patients work with a therapist as part of their care team. She has extensive experience treating patients in various settings, including community mental health centers, VAMC-affiliated clinics, and hospital-based psychiatric units. She also has expertise in psychiatric consultations for medically ill patients, as well as guardianship and competency evaluations.

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What you can expect in a first visit

Patients can expect a thorough initial evaluation, where Dr. Vansickle takes the time to understand their symptoms, history, and treatment goals. She provides a structured yet compassionate approach to care, ensuring that each patient feels heard and supported. Follow-up visits typically last 30 minutes, during which she monitors progress and adjusts treatment as necessary. If additional therapy is needed, she collaborates with therapists to ensure comprehensive care tailored to each patient’s needs.

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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.

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Dr. Ana Lilian Reyes is a board-certified psychiatrist that earned her M.D. from the University of Florida, where she served as a chief resident. She received multiple academic honors, including the Peter Regan, M.D. Award for academic excellence in psychiatry and the John E. Adams academic achievement award throughout her course of training. She also holds a B.A. in Psychology with a neuroscience focus from Harvard University.

Dr. Reyes is passionate about outpatient psychiatry and values the long-term, collaborative relationships formed in the clinic setting. She has a particular interest in women’s and reproductive mental health and has been involved in research and protocol development focused on perinatal depression. She also brings additional training in cognitive behavioral therapy and psychodynamic psychotherapy to her work. Additionally, she has worked with underrepresented college-aged populations pursuing careers in STEM.

Her approach is rooted in blending psychotherapy and psychopharmacology. She emphasizes a full lifestyle approach and a therapeutic space wherein patients can engage in self-reflection and expression.

Fluent in English and Spanish, Dr. Reyes is dedicated to providing culturally responsive care that supports patients in achieving lasting emotional health.