Ethan Atwood, MD

Dr. Sara Mateo holds the position of staff Psychiatrist at Talkiatry. She is a board-eligible adult Psychiatrist. Dr. Mateo completed her Medical degree at the University of Benghazi- Faculty of Medicine and finished General Psychiatry Residency training at Tower Health/DrexelPhoenixville Hospital. Throughout her career, Dr. Mateo has actively contributed to various leadership roles and committees, demonstrating her commitment to advancing medical education and promoting diversity in the field. During her training, she generously shared her knowledge through educational presentations and lectures, fostering the growth of fellow trainees and medical students. Dr. Mateo is dedicated to creating a therapeutic environment characterized by warmth, empathy, and nonjudgmental support. Her approach involves collaborating with patients to develop individualized treatment plans that consider cultural, biological, psychological, and social factors. With a primary focus on medication management, Dr. Mateo's keen interest in psychotherapy is evident, as she often integrates supportive therapy, cognitive behavioral therapy, and psychodynamic psychotherapy during 30-minute follow-up visits to optimize wellness and recovery. Dr. Mateo brings a wealth of experience in caring for individuals of diverse ages and backgrounds, adeptly addressing a wide spectrum of conditions. Her expertise extends to treating depressive disorders, bipolar disorders, anxiety disorders, trauma and stress related disorders, ADHD, OCD, Insomnia, psychotic disorders; she also has experience treating individuals with medical comorbidities.

Dr. Desir is a Board-Certified Psychiatrist who completed her undergraduate training at The University of Scranton followed by medical school at the New York Institute of Technology College of Osteopathic Medicine. She completed psychiatry residency at Nassau University Medical Center where she served as the Administrative Chief Resident in her final year. Dr. Desir has been in practice for 4 years and has provided patients with compassionate psychiatric care. She has worked in community mental health settings throughout her career, in which she served a wide variety of patient populations. Dr. Desir is experienced in treating various psychiatric illnesses including mood disorders, anxiety disorders, OCD, PTSD, and ADHD. At the heart of Dr. Desir's clinical approach is a strong emphasis on establishing trust and building a therapeutic relationship. She also provides psychoeducation to help patients make informed decisions regarding their care. She works collaboratively with patients to develop individualized treatment plans to help them achieve their goals. Dr. Desir's practice focuses on medication management. Typically, she offers this in conjunction with supportive or emotionally focused therapy in 30-minute follow-up visits. Occasionally, Dr. Desir may believe that additional therapy is also needed and ask that you bring a therapist into your care team to provide the best outcome. Talkiatry takes medication management seriously. All state-controlled substance databases are reviewed and taken into consideration during your initial evaluation.

Dr. Kevin DiCesare is a board-certified psychiatrist, treating adults. He received his undergraduate degree at Harvard University, his medical degree at the University of Massachusetts Medical School, and then went on to train at Maine Medical Center for his psychiatric residency. He has 22 years of expertise in diagnosing and treating psychiatric conditions, including depression, anxiety, Bipolar spectrum disorders, adjustment problems, ADHD and other disorders. He is well versed in psychopharmacological interventions, but is a proponent of patients also being active in psychotherapy whenever appropriate. He prides himself in collaboratively arriving at treatment decisions with his patients, and taking the time to listen to their concerns and answer their questions.

Dr. DiCesare has worked in various settings, including community mental health centers and large hospital systems, with experience in inpatient, outpatient, and consultative roles. Prior to joining Talkiatry, he most recently served as an attending psychiatrist on the staff of Southern New Hampshire Health System, where he provided consultative care to referrals made from primary care providers and various specialists.

Dr. Peter Szeibel is board certified in adult psychiatry and has been practicing for over 36 years. His practice has focused primarily on medication management within the context of a supportive psychotherapeutic relationship. He also utilizes cognitive behavioral techniques. If the patient requires more intensive psychotherapy, Dr. Szeibel refers the patient to a therapist and collaborates with the therapist. Dr. Szeibel has experience in treating Depressive Disorders, PTSD, Panic Disorder, OCD, Bipolar Disorder, ADHD, and many other conditions. He feels his personal strengths include his inquisitiveness, scientific curiosity, and his desire to understand his patients better. Dr. Szeibel was born in Hungary, just a few months before the Hungarian Revolution against the Soviets broke out in 1956. He and his family fled under difficult circumstances and immigrated to the United States. Dr. Szeibel grew up in New York City. He attended The Bronx High School of Science, followed by Columbia University for his B.A., where he took a double major in chemistry and music. After obtaining his M.D. from S.U.N.Y in Syracuse, he returned to New York City for residency and fellowship training. During this time he won the Bendheim Fellowship Award at Cohen Children's Medical Center for his research study which examined the effects of background music on the academic performance of children with ADHD. His current areas of interest include adult ADHD, psychiatric and medical co-morbidities, and the LGBTQ population.

Dr. John Weller, MD, is a psychiatrist with a strong foundation in science and clinical care. He earned his undergraduate degree in molecular genetics from the University of Vermont and conducted neuroscience research in both academic and industry settings. A graduate of St. George’s University School of Medicine, he completed his psychiatry residency at Mather Hospital, Northwell Health, where he was honored as Resident of the Year in 2025 and inducted into the Alpha Omega Alpha Honor Medical Society.

Dr. Weller is committed to providing compassionate, evidence-based care that considers the full spectrum of biological, psychological, and social factors. He builds therapeutic relationships on empathy, respect, and trust. By tailoring treatment plans to each patient’s personal and cultural context, he helps individuals take control of their mental health and work toward long-term recovery and resilience.

In the first session, Dr. Weller takes time to listen carefully and gather a thorough understanding of each patient's concerns, history, and current functioning. He uses empathy and active listening to foster open communication and develop personalized treatment plans that may include therapy, medication, or lifestyle changes, with the goal of restoring wellness and stability.

Dr. Blanca Osorio-Candelaria is a board-certified adult psychiatrist and has been practicing for over 16 years. Her practice focuses on medication management, which she typically combines with supportive therapy in 30-minute follow-up visits. If Dr. Osorio-Candelaria feels you would benefit from working with a therapist in conjunction with medication management, she welcomes collaboration with your therapist to make for the best outcome. ‍Dr. Osorio-Candelaria is a graduate of the University of Puerto Rico School of Medicine in San Juan, PR. She completed her residency at Tripler Army Medical Center in Hawaii, followed by a fellowship in Child and Adolescent Psychiatry. Her years of experience started as a medical officer for the Army, including a deployment to Iraq. Her working experience after her military service includes working as a medical director of a community health center, a medical director of a community hospital, a medical director of an inpatient unit, and working for an Assertive Community Treatment Team (ACT) specializing in the Serious Mentally Ill population.‍Dr. Osorio-Candelaria specializes in psychopharmacology, especially tailoring individualized treatment to serve the needs of patients with a variety of conditions. She has a lot of experience in treating patients with depression, anxiety, bipolar disorders, post-traumatic stress disorders, Insomnia, and ADHD. She also has experience in treating patients with medical comorbidities.