Gregory Miller, DO

Rebecca Kostopoulos, PMHNP, is a board-certified psychiatric nurse practitioner committed to helping individuals facing mental health challenges lead full and balanced lives.

Her practice primarily focuses on medication management, often combined with supportive or emotionally focused therapy during 30-minute follow-up visits. When appropriate, Rebecca may recommend involving an additional therapist to ensure the most effective and comprehensive care.

She earned her Master of Science in Nursing with a specialization in psychiatry from Columbia University and her Bachelor of Science in Nursing from Boston College. Her training includes psychiatric diagnosis, medication management, and both psychodynamic and cognitive-behavioral therapies.

With over a decade of experience, Rebecca has evaluated and treated adults in a variety of clinical settings. Her previous roles include working at Elmhurst Hospital’s Comprehensive Psychiatric Emergency Program, Gracie Square Hospital’s inpatient unit, as well as in community health centers and skilled nursing facilities.

As a nurse practitioner, Rebecca believes that mental health is just as vital as physical health. She values the therapeutic relationship and approaches treatment with empathy and collaboration, ensuring that each patient receives personalized and compassionate care.

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Dr. Mark Sundahl is a board-certified adult psychiatrist. He was born and raised in the suburbs of Kansas City, Kansas. He has always been fascinated by the natural world and received a bachelor’s degree in biology at Kansas State University where he was active in a research lab investigating protein function in the human body. He completed medical school training and residency at the University of Kansas School of Medicine in Kansas City, Kansas along with Wichita, Kansas. Dr. Sundahl has experience working with a broad range of mental health symptoms and a diverse patient population

Dr. Mark Sundahl is a board-certified adult psychiatrist. He was born and raised in the suburbs of Kansas City, Kansas. He has always been fascinated by the natural world and received a bachelor’s degree in biology at Kansas State University where he was active in a research lab investigating protein function in the human body. He completed medical school training and residency at the University of Kansas School of Medicine in Kansas City, Kansas along with Wichita, Kansas. Dr. Sundahl has experience working with a broad range of mental health symptoms and a diverse patient population

Dr. Sundahl understands the importance of collaboration and the therapeutic alliance when working with patients. He will clearly explain his findings and discuss treatment options he feels are reasonable. Dr. Sundahl thinks it is important for patients to have all the necessary information to make informed decisions when it comes to their psychiatric treatment.

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Dr. Kamil Dar graduated from Boston Medical Center Brighton, Massachusetts, from the Department of Psychiatry. He received his training in Interventional Psychiatry including ECT and TMS at Beth Israel Deaconess Medical Center, a Harvard University Teaching Hospital. He has multiple publications in research. Dr. Dar is culturally diverse and speaks English, Urdu, Punjabi, Hindi and Chinese Mandarin. In his free time, he enjoys playing sports with his family, including soccer and cricket.

While assessing his patients with the biopsychosocial model, he treats with evidence based treatment.

He utilizes therapeutic techniques such as cognitive behavioral therapy and psychodynamic therapy in conjunction with medication for optimal results.

Dr. Caitlin Meyer is a board-certified in adult psychiatry with experience in a wide variety of psychiatric disorders including depression, anxiety, women's mental health, and ADHD. Dr. Meyer's practice is focused on medication management with supportive therapy offered in 30-minute follow-up visits. Dr. Meyer received her medical degree from the University of Texas Southwestern Medical Center in Dallas, Texas, where she received the North Texas Society of Psychiatric Physicians' Award for outstanding medical student in Psychiatry. She pursued her residency in adult psychiatry at Brown University in Providence, Rhode Island, with particular interest and training in child, adolescent, and young adult Psychiatry. After completing training, Dr. Meyer worked with children and adults in a variety of treatment settings including Community Mental Health Centers and hospitals, providing inpatient, residential and outpatient services. Prior to joining the Talkiatry team, Dr. Meyer participated in psychiatric research developing new treatment methods for complex psychiatric disorders. Dr. Meyer enjoys treating patients across the lifespan from young adulthood through senior care. She sees each patient as a unique individual and works together with her patients to develop a treatment plan specific to their needs and goals.

Dr. Cyndia Choi has been board certified in psychiatry since 1991. She has 30 years of experience treating a diverse population of cultures, LGBTQ issues, and different age groups from young adults to seniors. After attending Johns Hopkins University in Baltimore for her bachelor's degree, Dr. Choi received her medical degree from The University of Medicine and Dentistry of New Jersey at Rutgers Medical School. She went on to complete a general medical internship at Hahnemann University Hospital in Philadelphia and then her Psychiatric residency at the University of Pennsylvania .Dr. Choi has treated patients who have had a broad spectrum of diagnoses including major depressive disorder, post-traumatic stress, bipolar disorder, OCD, panic and anxiety, and addiction. Although the majority of her work has been in outpatient care, Dr. Choi has worked in emergency settings, inpatient units, and as a consultation-liaison to medical units. She has also enjoyed the honor of working with US military veterans. Dr. Choi's specialty is medication management, however, she believes that a therapeutic relationship is crucial to treatment. Dr. Choi values the privilege of getting to know each patient personally to develop a patient-centered plan of care.‍Typical follow-up appointments with Dr. Choi are 30 minutes in length to check on medication effects and for supportive therapy. If she believes that you may benefit from more in-depth therapy, she may recommend adding a therapist to your treatment team. Dr. Choi also believes in a holistic approach toward helping you achieve a healthy and fulfilling quality of life.

Dr. Cash attended Wright State University Boonshoft School of Medicine, where she developed a strong foundation in medicine and a passion for psychiatry. She completed her residency at Wright State University, honing her skills in understanding and treating mental health conditions.

Dr. Cash has worked in various outpatient settings, treating patients with mental health disorders including depression, anxiety, PTSD, ADHD, and mood disorders. She is board-certified in general psychiatry and addiction medicine, and believes in a holistic approach to care. Dr. Cash is committed to helping patients navigate their mental health journeys and to providing compassionate, personalized care.

Dr. Cash works closely with patients to develop treatment plans that combine medication, lifestyle changes, and psychotherapeutic strategies to address their unique needs.