Michelle Hornbaker-Park, MD

Dr. Aileen Kim approaches medication management with an emphasis on shared decision-making within safe, effective options, thorough counseling about what to expect in treatment, and giving attention to the concurrent use of non-medication modalities of treatment alongside optimizing medication. She is accustomed to working with people who have more than one diagnosis. She is skilled and experienced in de-prescribing (methodically streamlining the number of medications being taken) when needed. Patients can see Dr. Kim for medication management, therapy, or both. Dr. Kim is board certified in Adult Psychiatry. She graduated from the University of Illinois College of Medicine in Chicago in 2004. She was selected for the Health Professions Scholarship Program and completed her residency in 2008 at Naval Medical Center Portsmouth in Virginia, where she was chief resident. Following residency, she deployed to Kuwait as a medical officer. She has taught and supervised residents at Walter Reed National Military Medical Center. She left active duty in the Navy as a Lieutenant Commander. After becoming a civilian, she went into solo practice, then joined Potomac Behavioral Solutions in 2014, where she served as medical director. Dr. Kim is a past president of the Virginia Psychoanalytic Society. She also lectures advanced mental health professionals for Lingyu International Psychology Centre based in Toronto. For established patients of Dr. Aileen Kim, please call 833-351-8255 to schedule an appointment and let the patient care coordinator know you are an established patient from her prior practice.

Dr. Kethini is a board-certified psychiatrist in General psychiatry. She completed her medical degree at St. George's University School of Medicine in Grenada. After completing her residency at Bergen New Bridge Medical Center, she transitioned to an attending psychiatrist at the same place where she completed her residency. During her initial years as an attending, she took care of her own patients and supervised third year residents in the outpatient setting. After a few years, she transitioned to an inpatient setting, where she treated both voluntary and involuntary patients. She also continued to evaluate patients in the emergency room as part of the call group for the last 8 years. ‍Dr. Kethini is passionate about and very experienced in providing a holistic approach along with evidence-based care for patients battling depression, anxiety, bipolar disorder, OCD, ADHD, and PTSD. She integrates supportive psychotherapy along with medication management and lifestyle changes such as nutrition, exercise, sleep hygiene, and stress management. She is focused on having a collaborative approach to treatment and forming a therapeutic alliance with every single patient under her care.

Dr. Zeynep Altun is board-certified in Psychiatry and holds a Ph.D. in Neuroscience. Dr. Altun graduated cum laude from Istanbul University, Istanbul Medical School. She completed her residency training in Neurology and is Turkish board-certified in clinical Neurology. Subsequently, she moved to the U.S. and finished her Ph.D. in cellular Neuroscience at Cornell University Graduate School of Medical Sciences. Dr. Altun completed her psychiatry residency training at Albert Einstein College of Medicine, Department of Psychiatry and after, her clinical fellowship in Comprehensive Psychiatric Emergency Program at Columbia University Medical College, New York Presbyterian Hospital. Dr. Altun has practiced in various settings including Bellevue Hospital, New York Presbyterian Hospital, Columbia Doctors Faculty Practice Office, Mount Sinai West and Mount Sinai Morningside Hospitals. Dr. Altun has held various academic appointments at New York University School of Medicine Department of Psychiatry; New York Presbyterian Hospital-Columbia University Medical College Department of Psychiatry; New York State Psychiatric Institute and Mount Sinai School of Medicine Department of Psychiatry. She spent most of her professional career supervising and teaching medical students, psychiatry residents and nurse practitioners. As an adult psychiatrist, Dr. Altun has extensive theoretical knowledge of the nervous system and its disorders and more than 10 years of experience in treating various mental illnesses including mood disorders, anxiety disorders, psychotic disorders, autism-spectrum and neuropsychiatric disorders, psychiatric emergencies and crisis management as well as cognitive behavioral and supportive psychotherapy. In Columbia Doctors, she collaborated closely with the Lieber Recovery Clinic, treating young adults with various mental illnesses. The philosophy of her practice is to collaborate with patients and work together with them so that they can lead symptom-free, productive, and stable lives.

Maegan Roberts, PMHNP, earned her MSN from Indiana University School of Nursing and her BSN from the University of Evansville. She worked as a Registered Nurse in inpatient psychiatry for five years before transitioning to outpatient care as a psychiatric nurse practitioner in 2017. Maegan has experience treating patients across the lifespan, from school-aged children to older adults. She is especially attuned to the challenges of young adulthood, parenting, and navigating complex family dynamics. Committed to lifelong learning, she values the insights and perspectives her patients bring to their care.

Maegan creates a therapeutic environment grounded in dignity, empathy, and respect. She empowers patients through education about diagnoses, symptoms, and medications while promoting autonomy and informed decision-making. Her approach blends psychopharmacology with supportive therapy, skill-building, and sustainable lifestyle strategies, helping patients build insight and resilience.

In the initial appointment, Maegan takes time to understand each patient’s history, concerns, and goals. From there, she collaborates with patients to create and adapt treatment plans that align with their evolving needs, always keeping the individual’s unique context and aspirations at the center of care.

Matthew Twomey, PMHNP, earned his BSN and MSN from the Massachusetts General Hospital Institute of Health Professions School of Nursing. He began his career as an adult psychiatric nurse practitioner in community health centers before commissioning as an officer in the U.S. Army Nurse Corps. After five years of active duty, he continued caring for service members and families at Fort Bliss as a civilian provider for nearly six years. He now practices in the private sector, bringing broad clinical experience to diverse patient populations.

Matthew is skilled in psychopharmacology, evidence-based practice, and telehealth delivery. He combines strong clinical expertise with a patient-centered approach to improve outcomes and streamline care. Patients can expect thoughtful collaboration, clear communication, and treatment planning grounded in the latest research and tailored to their individual goals.

He specializes in psychopharmacology and precise medication management tailored to each patient’s unique needs. He also integrates supportive psychotherapy, motivational interviewing, psychoeducation, and cognitive behavioral therapy. Through active listening and mutual respect, he fosters a safe, supportive environment where patients feel heard, engaged, and empowered in their care.

What has motivated Dr. Wheatley over the course of her career as a caregiver? Dr. Wheatley is a native Houstonian who grew up in a working-class community. Through curiosity and hard work, she was able to attend a university that included people of vastly different life experiences. She was molded by both communities to appreciate the commonalities of humanity. That broad exposure extended her empathetic spectrum to grasp the needs of the American diaspora.

Dr. Wheatley uses a biopsychosocial approach to evaluate the patient. She gathers patient history with a mindset that considers the neuroscience that chemically shapes mood, thoughts, and behavior. She is able to uncover factors that can inhibit psychological growth and development. She has experience in seeing how the social conditions of the “then” can influence the resiliency of the “now”. Dr. Wheatley appreciates, and is proficient in, advances in technology, but prioritizes the analog relationship between doctor and patient.

Meeting people where they are. It is an old trope, but describes how one allows a patient to set the path forward. An open-ended interview is conducted with an open mind towards resolution. When being evaluated and treated by Dr. Wheatley, a patient can expect to be met in a cordial but professional manner. Treatments are discussed and considered based on the mental state of the patient and the clinical efficacy and scientific evidence of benefit. The patient is invited to ask questions and consider whether they wish to pursue the suggested treatment plan.

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