Lindsay Legnon, MD

Dr. Michelle Hornbaker-Park is a board-certified General and Child and Adolescent Psychiatrist with over nine years of experience. Her practice focuses on medication management, which is founded not only on evidence-based medicine but also on the understanding that a trusting therapeutic relationship is the cornerstone of behavioral health healing. She incorporates CBT, supportive therapy, and psychoeducation into her medication management appointments and may refer patients for additional psychotherapy to improve outcomes. Dr. Hornbaker-Park received her Bachelor of Science degree from Ursinus College, with a dual major in Biochemistry/Molecular Biology and Neuroscience. After receiving a Health Professions Scholarship from the Army, she obtained her medical degree from Jefferson Medical College. She went on to enter active duty military service and complete General Psychiatry residency training and Child and Adolescent Psychiatry fellowship training at Tripler Army Medical Center before completing active duty service as a staff psychiatrist and 101st Airborne Division psychiatrist at Fort Campbell, KY. There she cared for active duty service members and their families to manage depression, anxiety, trauma, and the unique stressors of military service. She later transitioned to federal civilian service and served as a preceptor for Phase II Physician Assistant trainees and Army Social Work interns, reinforcing a passion for education that carried her to Walter Reed National Military Medical Center (WRNMMC). During her time at WRNMMC, she served in several roles including Deputy Medical Director of Inpatient Psychiatry, core faculty for the National Capital Consortium Psychiatry Residency Program, Associate Program Director, and associate faculty at the Uniform Services University for Health Sciences (USUHS). Prior to transitioning out of federal service to join Talkiatry, she was repeatedly recognized for excellence in academics and mentorship and received multiple teaching awards. This zeal for education and mentorship, as well as humility, personal growth, and learning, translates directly into her philosophy for patient care. She believes a whole-person approach with open, collaborative teamwork is the key to progress.

Dr. Mousavi holds the position of attending psychiatrist at Talkiatry. She is Board certified in adult psychiatry and has been practicing for over 6 years. Dr. Mousavi's practice focuses on medication management. Typically, she offers this in conjunction with supportive therapy in 30-minute follow up visits. Dr. Mousavi may believe that additional therapy is also needed and ask that you bring a therapist into your care team to provide the best outcome. She has completed her residency at Westchester Medical Center/New York Medical College. She has experience of working in private practice at the Institute for Family Therapy in Miami. She has also worked as an outpatient psychiatrist at Montefiore in NY and INOVA outpatient clinic in Virginia.

Dr. Garrick Gaffney 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

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Severine Dondina, PMHNP-BC, is a board-certified psychiatric nurse practitioner with licensure in Washington and Florida. She holds a Master of Science in Nursing from the University of Alabama at Birmingham and graduated summa cum laude with dual bachelor’s degrees in nursing and biomedical science. Her background spans outpatient, community, forensic, and crisis psychiatry, including leadership roles with Florida’s Assertive Community Treatment (FACT) and Multi-Disciplinary Forensic Teams.

Currently serving patients in Washington, Severine treats adults with ADHD, anxiety, depression, PTSD, and bipolar disorder. She brings a trauma-informed, strengths-based approach to care and is deeply committed to creating affirming spaces for LGBTQ+ and gender-diverse individuals. Her clinical style combines evidence-based medication management with warm, collaborative support.

Trilingual in English, French, and Spanish, Severine is known for her cultural sensitivity, clinical rigor, and authentic presence. She approaches each patient with curiosity, humility, and respect—believing healing begins with connection.

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Dr. Vanessa Valdes is an adult psychiatrist specializing in medication management and psychotherapy, with a strong focus on nutrition, wellness, and mindfulness. She earned her combined MD/MPH degree from the University of Miami Miller School of Medicine and completed her psychiatry residency at the University of Miami/Jackson Health System, one of the nation's leading public healthcare systems.‍During her residency, Dr. Valdes gained broad experience in diverse areas of psychiatry, including inpatient psychiatry, emergency psychiatry, outpatient care, psychotherapy, hypnosis, child and adolescent psychiatry, consultation-liaison psychiatry, psycho-oncology, and addiction psychiatry.‍Dr. Valdes primarily provides supportive psychotherapy and acceptance and commitment therapy to help patients better understand and address their stressors. She takes a holistic approach to care, emphasizing the emotional, spiritual, and physical well-being of her patients. Her goal is to inspire meaningful, sustainable changes in patients' lives through compassionate, comprehensive treatment.

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.