Jennifer Hailey, DO

Dr. McGowan is a board-certified adult psychiatrist with over 14 years of experience, during which time he primarily treated active-duty US Navy sailors, their family members, and military retirees in the outpatient setting. His practice focuses on medication management in addition to supportive and cognitive-behavioral therapy in 30-minute follow-up visits. He is a strong advocate of multiple treatment modalities and, in certain situations, may suggest that therapy and/or regular physical exercise be included in your treatment plan to provide the best outcome. He received his B.S. in Physics from the United States Naval Academy. After serving as an Intelligence Officer in the Navy for eight years, he transitioned to medicine and earned his medical degree from the Uniformed Services University of the Health Sciences in Bethesda, MD. After completing an intern year in Family Medicine, Dr. McGowan completed residency training in Psychiatry at Naval Medical Center Portsmouth, VA, where he remained on staff for the next ten years and was primarily involved in resident training and education. He held academic appointments at the Uniformed Services University and Eastern Virginia Medical School and served as the Psychiatry Residency Program Director for six years. He served his final four years in uniform running the behavioral health department at Naval Air Station Whidbey Island, WA. He recently retired from the Navy after a 30-year career. Dr. McGowan has extensive experience in outpatient psychiatric care. In addition to the full spectrum of mood and anxiety disorders, he has treated a very large number of patients with PTSD stemming from combat, natural disasters, and sexual trauma. He believes that, like his service to the country, working alongside others in their journey to better mental health is an incredible privilege.

Dr. Liss was born and raised in a neighborhood in the North Bronx. He attended Queens College, CUNY where he graduated Summa Cum Laude with a B.A. in Hebrew. He completed Medical school at NYIT College of Osteopathic Medicine in Old Westbury, NY and thereafter was accepted to NUMC for psychiatry residency training. For his final year of residency training Dr. Liss was appointed to the position of Chief Resident for Academics & Research for the Psychiatry residency program at NUMC, Nassau University Medical Center. He received two awards during his residency training, including the Acute Mental Health Services Award and the Ambulatory Mental Health Services Award at the end of his 2nd and 3rd years of residency training, respectively. At NUMC, Dr. Liss underwent a rigorous training in a multitude of psychiatric settings and has experience with managing a wide array of psychiatric areas of treatment including mood/bipolar disorders, ADHD, depression, anxiety, personality disorders, as well as the intersection of medical disorders and psychiatric disorders. For his outpatient practice, Dr. Liss anticipates focusing on mood disorders, anxiety disorders, OCD, personality disorders, and family dynamics .Dr. Liss' practice focuses on a duality of treatment strategies: specifically psychotropic medication management in conjunction with non-pharmacologic treatment modalities including supportive psychotherapy, emotive supportive psychotherapy, as well as personalized variants of psychodynamic/interpersonal psychotherapy. Additionally, Dr. Liss has experience facilitating the coordination of psychosocial treatments in underserved populations.‍

Dr. Jacob Webbert is double board-certified in Psychiatry and Addiction Psychiatry. He earned his medical degree from the Lake Erie College of Osteopathic Medicine in Erie, PA, and completed his psychiatry residency at Albany Medical Center in Albany, NY. He then pursued fellowship training in Addiction Psychiatry at Dartmouth-Hitchcock Medical Center in Lebanon, NH. Dr. Webbert has extensive experience across telehealth, outpatient psychiatry, and substance use disorder treatment programs, providing comprehensive care tailored to a wide range of patient needs.

Dr. Webbert takes a supportive, non-judgmental approach to care, prioritizing open communication and trust in the treatment process. He works with patients to set realistic, meaningful goals that align with their values and promote lasting improvement in mental health. His patients can expect a collaborative partnership where they feel heard, respected, and empowered to take an active role in their care.

Dr. Webbert begins by listening carefully to each patient’s unique story, concerns, and goals. From there, he develops a personalized treatment plan that may include therapy, medication management, or a combination of both. He collaborates with patients over time, adjusting the treatment plan as needed to best support progress and recovery, with the shared aim of building resilience and achieving sustainable wellness.

Dr. John Weller, MD, is a psychiatrist with a strong foundation in science and clinical care. He earned his undergraduate degree in molecular genetics from the University of Vermont and conducted neuroscience research in both academic and industry settings. A graduate of St. George’s University School of Medicine, he completed his psychiatry residency at Mather Hospital, Northwell Health, where he was honored as Resident of the Year in 2025 and inducted into the Alpha Omega Alpha Honor Medical Society.

Dr. Weller is committed to providing compassionate, evidence-based care that considers the full spectrum of biological, psychological, and social factors. He builds therapeutic relationships on empathy, respect, and trust. By tailoring treatment plans to each patient’s personal and cultural context, he helps individuals take control of their mental health and work toward long-term recovery and resilience.

In the first session, Dr. Weller takes time to listen carefully and gather a thorough understanding of each patient's concerns, history, and current functioning. He uses empathy and active listening to foster open communication and develop personalized treatment plans that may include therapy, medication, or lifestyle changes, with the goal of restoring wellness and stability.

Background and credentials

Dr. Matthew Koller is a board-certified adult psychiatrist who completed his undergraduate training at The University of Texas at Austin. He earned his medical degree from The University of Texas Health Science Center at San Antonio and completed his general adult psychiatry residency at Baylor College of Medicine in Houston, TX, where he served as Chief Resident of Education in his final year of training.

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Treatment approach

Dr. Koller believes that understanding a patient fully is essential before treatment begins, emphasizing a collaborative and patient-centered approach to care. His practice is primarily focused on medication management, but he also incorporates supportive therapy and other therapeutic modalities as needed. He may recommend including a therapist in the treatment plan to ensure comprehensive, well-rounded care. He has experience treating a wide range of mental health conditions, including depression, anxiety, insomnia, personality disorders, bipolar disorder, PTSD, and psychotic disorders.

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What you can expect in a first visit

During the first visit, patients can expect a thorough and individualized psychiatric evaluation, where Dr. Koller takes the time to understand their symptoms, history, and treatment goals. He prioritizes open communication and shared decision-making, working closely with patients to develop personalized treatment plans. While medication management is the foundation of his approach, he remains flexible and adaptive, incorporating therapy and other interventions as needed to help patients achieve optimal mental health.

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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. Mennella is a board-certified adult psychiatrist. Her practice focuses on medication management and supportive therapy. Treatment emphasizes patient education and autonomy. Dr. Mennella is a proponent of shared decision-making and believes this facilitates a strong therapeutic relationship, greater satisfaction with care, and improved clinical outcomes. She completed an undergraduate degree in Information Technology from Purdue University and a master's degree in information systems from DePaul University. She received her medical degree from the University of Toledo College of Medicine and then completed her psychiatry residency at Loyola University Medical Center. Areas of interest include depression, bipolar, anxiety, and PTSD.