Mary Poupon, PMHNP

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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Dr. Troy Grantham is a board-certified staff psychiatrist who treats adult patients. A former engineer, Dr. Grantham has developed a passion for guiding patients along the road to recovery. He completed his undergraduate studies at The University of Texas at Austin and later completed medical school and residency in General Psychiatry at The University of Texas Medical Branch at Galveston. Dr. Grantham's practice focuses on medication management. He utilizes a systematic approach to ensure diagnoses are accurate and treatment plans are optimized to each individual patient. His approach is also holistic in nature, often incorporating therapy and lifestyle modification into the treatment plan. Dr. Grantham employs multiple therapeutic approaches in his practice depending on the needs of the patient including supportive therapy, Cognitive Behavioral Therapy (CBT), and Acceptance and Commitment Therapy (ACT). He places great emphasis on psychoeducation so that patients are aware of the nature and prognosis of their conditions as well as the treatment options available. When multiple treatment options are reasonable, Dr. Grantham takes patient preference into account, offering flexibility to the patient experience. He treats a variety of psychiatric disorders with a particular focus on mood disorders, anxiety disorders, obsessive-compulsive disorders, and trauma-related disorders.

Please note: Dr. Grantham does not prescribe long-term, daily benzodiazepine medications, however he is happy to help you taper off of these medications and transition to a safer, long-term medication regimen.

Tessa Goodman, DO, earned her Bachelor of Science Honors degree in neuroscience and animal behavior from Cornell University and a Master’s in Education through the NYC Teaching Fellows Program. She completed medical school at NYIT COM and psychiatry residency at SUNY Downstate Medical Center, followed by a Geriatric Psychiatry Fellowship at Cornell Medical Center. She served as a faculty member on the inpatient psychiatry service at Cornell Medical Center and later as administrative psychiatrist overseeing the Telepsychiatry Consultation Liaison service at Cornell and Columbia Medical Centers for over five years.

Dr. Goodman prides herself on being a warm, kind, and supportive provider. She has expertise in psychopharmacology and is a published textbook author on medication management. She practices psychiatry using evidence-based medicine and values open communication, creating a safe space where patients feel heard, respected, and empowered.

Dr. Goodman takes time to thoroughly understand each patient’s history, concerns, and goals. She develops individualized care plans, thinks creatively about treatment options, and works collaboratively with patients to meet their unique needs and achieve meaningful progress.

Dr. Tetyana Tarnavsky is a board-certified psychiatrist trained in Adult Psychiatry. She attended Dnipropetrovsk State Medical Academy in Ukraine where she received her M.D., M.S. and Ph.D. degrees in Psychiatry. Dr. Tarnavsky completed her residency at Harvard South Shore Psychiatry Residency Training Program in MA, where she was elected chief resident. Dr. Tarnavsky has an extensive research experience in Ukraine and the USA. She had studied computer addiction for her dissertation; had multiple abstracts and presentations; published several articles in peer-reviewed psychiatric journals as well as a book entitled Computer Addiction: Formation, Diagnosis, Correction and Prophylaxis. She has helped organize international conferences with the goal of improving access to and quality of healthcare in Dnipropetrovsk, Ukraine, and providing a national model for health care reform. Dr. Tarnavsky has worked with a variety of patients with diverse backgrounds in a Community Health Center and in the Partial Hospitalization Program as well as supervised medical students, psychiatry residents, and nurse practitioners. She has been a lecturer on psychiatry at Harvard Medical School and was involved in the training of psychiatry residents in the Harvard South Shore Psychiatry Training Program. Her primary focus has been on treating adults with depression, anxiety, post traumatic stress disorder, adjustment disorder, ADHD and other disorders. Dr. Tarnavsky strives to provide quality and compassionate treatment to individuals and their families.‍

Dr. Michael Petetit has worked with people from many different walks of life in clinics, hospitals, and online, providing evidence-based treatments for a wide range of mental health conditions. His professional journey is unique—he began his career as a research chemist, later earned a Master’s degree in psychology and worked with children, before pursuing his medical degree and completing a psychiatry residency.

Dr. Petetit approaches treatment as a true collaboration. He partners with patients to clarify goals and create individualized treatment plans that reflect their priorities and values. He strives to be non-judgmental, direct, and honest in his style, building a therapeutic relationship that supports open communication and trust.

Dr. Petetit begins with a thorough evaluation to understand each patient’s circumstances and challenges. From there, he works with patients to set and prioritize goals, review treatment options, and select a plan that feels both comfortable and practical. As treatment progresses, he regularly revisits and refines the plan, ensuring it remains effective and aligned with the patient’s evolving needs.

Dr. Beck completed medical school at The University of Oklahoma College of Medicine and completed psychiatry residency at The University of Oklahoma School of Community Medicine. She has a particular interest in perinatal/reproductive psychiatry and is pursuing additional training and certification in this subspecialty. Throughout her training, Dr. Beck has been involved in advocating for patients both at the state level as well as through her involvement with the American Medical Association.

Dr. Beck tends to have a relaxed but professional manner with patients. She prioritizes understanding patient concerns and providing education. Dr. Beck aims to use her medical expertise to advise you as you work together to create a strategy that will empower you to take charge of your mental health.

New patients should expect a thorough review of their history and symptoms as they are establishing care with Dr. Beck. One of the most important steps to helping you get better is to make sure the diagnosis is correct. From there Dr. Beck will work with patients to find appropriate medication strategies, as well as other evidence-backed interventions like therapy and lifestyle changes that fit your unique situation.