Zeynep Altun, MD, PhD

Dr. Rebecca Crosbie is a board-certified adult psychiatrist and has been practicing in outpatient psychiatry for nearly 7 years. Her practice focuses on medication management, and she typically offers medication management combined with supportive therapy or Cognitive Behavioral Therapy (CBT) in 30 minute follow-up visits. If Dr. Crosbie feels you would benefit from working with a dedicated talk therapist, she may encourage you to pursue this or refer you in order to achieve the best outcome. Dr. Crosbie is a graduate of Michigan State College of Human Medicine. She completed her psychiatry residency at Pine Rest/Michigan State University in Grand Rapids, MI. She has previously worked as an outpatient psychiatrist and in tele-psychiatry. She has a lot of experience treating patients with a broad array of mental health conditions, including: anxiety disorders, depression, OCD, bipolar disorder, and ADHD. She also treats combined mental health diagnoses such as ADHD plus another diagnosis. She also has a lot of experience working with patients who identify as LGBTQI+. Her approach is always to meet the patient where they are and educate and enable patients to make good choices about treatment that are in line with their personal preferences and values.

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. Michael Lukowski is an adult psychiatrist who holds board certification with the American Board of Psychiatry and Neurology. He has been practicing medicine for over 4 years. Dr. Lukowski focuses on medication management combined with supportive therapy in 30-minute follow-up visits. He practices whole-person medicine, caring for the wellness of your mind, body, and spirit and helping you enjoy your relationships with those around you. Dr. Lukowski received his medical degree from the University of Nevada School of Medicine in Reno, NV, before moving to southern California to complete his residency at Loma Linda University. After completing training, Dr. Lukowski began working with the Southern California Permanente Medical Group in Riverside, CA, where he treated a variety of psychiatric disorders in an outpatient setting. In March of 2020, as the pandemic changed life and medicine forever, Dr. Lukowski adopted a strictly telepsychiatry role at his clinic. He has also held a staff psychiatrist position as an adult inpatient psychiatrist in Tennessee. Dr. Lukowski treats a wide variety of psychiatric disorders within the adult demographic.

Dr. Adele Veksman is double board-certified in adult psychiatry and psychosomatic medicine, with over 14 years of experience diagnosing and treating a wide range of psychiatric conditions. She approaches each patient as a unique individual, offering a non-judgmental space to help patients develop into their best selves. She focuses primarily on medication management to alleviate symptoms while working with patients on behavioral changes to address underlying issues. If additional therapy is needed, she may suggest adding a therapist to your care team to provide the best outcome. Dr. Veksman received her medical degree from St. George's University and then completed a residency in psychiatry and fellowship in psychosomatic medicine at Zucker Hillside Hospital at Northwell Health. Next, she was an attending and ER psychiatrist at North Shore University Hospital providing psychiatric care to medically ill patients. She then transitioned to adult outpatient care at Maimonides Medical Center, treating various psychiatric illnesses. Throughout her career, she taught and supervised residents and medical students.

Dr. William Richie is an adult General and Forensic Psychiatrist. He earned his undergraduate and medical degrees from the University of Missouri Kansas City, completed his psychiatry residency at Howard University Hospital in Washington, DC, and later served as a Major in the United States Air Force. After his service, he returned to Howard as Chief of the Inpatient Psychiatric Service and completed fellowship training in Forensic Psychiatry at LSU Medical Center. Dr. Richie specializes in personality and dissociative disorders, pre-trial evaluations, and is especially interested in Men’s Mental Health.

Dr. Richie brings decades of clinical and academic experience to his practice. He believes that the foundation of effective care lies in a strong, respectful patient-psychiatrist relationship. His interpersonal and dialectical approach fosters collaboration, trust, and deeper understanding.

Dr. Richie takes time to listen carefully, ask thoughtful questions, and offer meaningful feedback. He works closely with each patient to develop a personalized treatment plan that supports long-term well-being and meaningful progress.

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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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