Jessica O'Mara, DO

Background and credentials

Dr. Nilesh Tannu is a board-certified psychiatrist by the American Board of Psychiatry and Neurology. He earned his medical degree from B.J. Medical College in Pune and completed his adult psychiatry residency at the University of Texas Medical School at Houston, where he served as chief resident. During his training, he received awards from the Society of Biological Psychiatry, the American Academy of Addiction Psychiatry, and the American Psychiatric Institute for Research and Education. He has been practicing General Psychiatry and Consultation-Liaison Psychiatry for the past seven years at Texas Medical Center in Houston, Texas. Additionally, he has served as an assistant professor of psychiatry at the Texas Medical Center, working at UT Physicians Clinics and Memorial Hermann Hospital. He is also a member of the Editorial Board for BMC Genomics Journal.

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Treatment approach

Dr. Tannu follows the bio-psycho-social model to provide evidence-based psychopharmacologic treatment. He integrates supportive therapy and cognitive-behavioral therapy (CBT) modalities into his practice to create personalized and comprehensive treatment plans. He is committed to mental health care, education, and helping patients achieve optimal functioning in their personal and professional lives. His clinical expertise includes ADHD, anxiety disorders, depressive disorders, bipolar disorder, psychotic disorders, insomnia, eating disorders, and complex medical comorbidities.

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What you can expect in a first visit

During the first visit, patients can expect a comprehensive assessment where Dr. Tannu takes the time to understand their symptoms, treatment history, and personal goals. He employs a collaborative approach to develop a tailored treatment plan that may include medication management and therapy interventions. His focus is on evidence-based care, ensuring that patients receive treatments that are scientifically backed and aligned with their individual 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. 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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Dr. Zhou is a board-certified psychiatrist who has more than 4 years of experience practicing in various clinical settings with an emphasis on mental health care in outpatient settings. She practices a holistic approach to developing an individualized plan to work toward a patient's goals. Dr. Zhou is experienced in treating depression, bipolar spectrum disorders, obsessive-compulsive disorders, post-traumatic stress disorder, generalized anxiety, and other related psychiatric disorders. Dr. Zhou received her medical degree from Texas Tech University Health Sciences Center School of Medicine and completed her adult psychiatry residency training at LSU Health Shreveport. Dr. Zhou's background and experiences have broadened her understanding of cultural stigmas and the relationship it plays in psychiatric care. She incorporates a multitude of treatment modalities such as supportive therapy, cognitive behavioral therapy, and mindfulness practices as an adjunct to pharmacotherapy. Dr. Zhou recognizes the value of a multifaceted approach to wellbeing and may recommend treatment modalities that are complementary to medication management.

Dr. Kristen Clark earned her medical degree from Jefferson Medical College and completed her psychiatry residency at Rutgers Robert Wood Johnson. She has extensive experience practicing primarily in outpatient settings, along with additional experience in inpatient, consultation, and emergency psychiatry. Dr. Clark has also served in academic roles, teaching and mentoring trainees in both medical school and residency. She is board-certified in Psychiatry and in Addiction Medicine.

Dr. Clark prioritizes creating a welcoming environment where patients feel comfortable sharing their experiences. She values building strong rapport and approaches care holistically, recognizing that each patient is unique and deserves an individualized treatment plan. She appreciates the ongoing nature of outpatient care and adapts her approach as patients’ goals and priorities evolve over time.

Dr. Clark takes a collaborative approach to treatment, working closely with patients to ensure their understanding of all available options. She empowers patients to make informed choices and partners with them to develop plans that best align with their needs, values, and goals for treatment.

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Michelle Harris is a board-certified psychiatric mental health nurse practitioner (PMHNP). She earned her Master of Science in Nursing in the psychiatric mental health track at the University of Saint Joseph and her Bachelor of Science in Nursing from the University of Connecticut. Her training includes psychiatric diagnosis, medication management, cognitive behavioral therapy, and motivational interviewing. With over a decade in psychiatric mental health care and 5+ years as a PMHNP, she has worked in outpatient, private practice, telehealth, inpatient, and homecare settings, treating patients from diverse backgrounds, including neurodivergent, LGBTQ+, BIPOC, and immigrant populations. She has a particular interest in ADHD, depression, anxiety, and OCD.

Michelle values a holistic approach to mental health and believes culturally sensitive care is essential. She strives to create a supportive environment for patients of all backgrounds and sexual orientations, ensuring each person feels understood, respected, and empowered in their care.

Michelle focuses on medication management with supportive therapy as appropriate. Initial sessions involve gathering a detailed patient history and discussing individual concerns. She works collaboratively with each patient to develop a personalized treatment plan, addressing their unique needs and goals.

Dr. Lauren Morris is a board-certified psychiatrist and a graduate of the Duke Psychiatry residency program. She is originally from NC - she studied Neuroscience at NCSU, and attended medical school at ECU. Dr. Morris's practice focuses on medication management, and incorporates insight-oriented therapy during visits. Dr. Morris takes a patient-centered evidenced based approach to psychiatry. Dr. Morris is joining the Talkiatry team after working as a staff psychiatrist at the Durham VA, where she also served as a consulting professor for the Duke psychiatry residency program. In her free time, Dr. Morris enjoys hiking and traveling.