Cedric Skillon, MD

Dr. Yaejin Park is a board-certified adult psychiatrist at Talkiatry. She received her medical degree from the University of Illinois at Chicago School of Medicine and completed her psychiatry residency training at Mount Sinai Morningside West.

Dr. Park has professional interests in treating a wide range of psychiatric conditions including depression, anxiety, PTSD, and eating disorders.  She strives to provide compassionate and holistic care with the integration of supportive psychotherapy and medication management.

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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Neena Tressa Mathew has built an impressive career in the medical field, with a strong focus on mental health. She is dually board-certified as a Psychiatric Mental Health Nurse Practitioner (PMHNP-BC) and Family Nurse Practitioner (FNP-BC), providing care across all age groups. Fluent in English, Hindi, and Malayalam, she is licensed to practice in Florida, New York, Texas, and Georgia. Neena offers a patient-centered approach that integrates her diverse experience and certifications.

Her dedication to mental health is evident through her extensive hands-on experience in assessing, treating, and evaluating patients with a wide range of psychiatric conditions, including ADHD, depression, anxiety, PTSD, OCD, schizophrenia, and bipolar disorder. She has delivered exceptional care at institutions such as Mindful Behavioral Healthcare, AdventHealth Hospital, and Park Place Behavioral Health Care. Her international experience includes roles in Canada, where she further developed her expertise in geriatric psychiatry. Neena has also worked in various practice areas, including addiction medicine, grief counseling, and primary care.

Her academic background includes a Post-Master’s Certification from Florida State University and a Master of Science from D’Youville College in Buffalo, NY. She also holds a Bachelor of Science in Nursing from Delhi University and a Master’s Degree in Social Work from the Delhi School of Social Work. Her professional affiliations, including membership in the American Nurses Association, reflect her commitment to the field. Recognized for her academic, leadership, and research capabilities, Neena was invited to join Sigma Theta Tau International (STTI) as a graduate nursing student for her excellence in scholarship and outstanding achievements in nursing.

Neena has contributed to several U.S. nursing journals and magazines and has published and presented research articles in international peer-reviewed journals. She maintains an active academic presence through platforms like Google Scholar and ResearchGate.

Her approach to care is both traditional—prescribing evidence-based psychiatric medications—and holistic, incorporating natural treatments such as vitamins, supplements, lifestyle modifications, nutrition, exercise, and stress management. She believes in the mind-body-spirit connection, viewing individuals as whole beings rather than a collection of symptoms, echoing the philosophy of Hippocrates, the "Father of Medicine." Her holistic philosophy is evident in her skillful management of psychotropic medications and her integration of psychotherapy, including supportive therapy, cognitive behavioral therapy (CBT), and psychodynamic therapy.

Neena’s primary interest lies in exploring the relationship between mental, physical, and spiritual health. She finds great fulfillment in helping others and goes beyond diagnosis and treatment by conducting thorough mental health assessments to ensure accurate identification of psychiatric conditions. What sets her apart is her commitment to patient education—empowering individuals and their families with a deep understanding of their conditions and treatment plans, including medication as part of a comprehensive care strategy.

In addition to her clinical work, Neena serves as a clinical instructor, sharing her knowledge and insights with future healthcare professionals. This dual role highlights her multifaceted contribution to healthcare, emphasizing both treatment and education in supporting individuals on their mental health journeys.

Outside of her professional life, Neena enjoys reading, writing, beach activities, hiking, and traveling with her family. She is also actively involved in charitable work through the Lions Club. She lives by the principle:

“Give, and it will be given to you. A good measure, pressed down, shaken together and running over, will be poured into your lap. For with the measure you use, it will be measured to you.” (Luke 6:38)

Indeed, she believes that it is in giving that we truly receive.

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Dr. Luna Sanchez Rivera holds the position of Staff Psychiatrist at Talkiatry. After completing residency in 2016 at the Ponce Medical School Psychiatry Residency in Puerto Rico, she then moved to North Carolina to complete a subspecialty in Child and Adolescent Psychiatry at Duke University Health System. There, she transitioned into an assistant professor position, focused on structuring pediatric emergency psychiatric services, and helped support the consult and liaison pediatric service. Her years of experience have included working as an integrated care child psychiatrist within outpatient clinics at Duke University Health System, and she trained and worked as a staff psychiatrist at the Inpatient State Facility in North Carolina. She also served in the Dayton Children's Hospital outpatient clinics in Dayton, Ohio, the Appalachian Health System outpatient clinics in Linville, North Carolina, and more recently has been serving the Child and Adolescent inpatient population in Bangor, Maine. Dr. Sanchez Rivera has an approachable style aimed at providing a comprehensive evaluation for all age ranges and is comfortable managing various levels of diagnostic complexities. She provides supportive psychotherapy while using psychodynamic therapy skills to clarify her patient's constellation of symptoms, identify unifying themes and provide thorough psychoeducation throughout the process to drive positive outcomes. She integrates psychodynamic medication management approaches and is adept at family therapy interventions.

Dr. Zachary Masuda earned his medical degree at Creighton University School of Medicine in Omaha and completed his Psychiatry residency at Creighton University School of Medicine in Phoenix. He went on to complete an Addiction Psychiatry fellowship at Oregon Health and Science University. During training, he was inducted into the Gold Humanism Honor Society, reflecting his commitment to compassionate care. Dr. Masuda is board-certified in general psychiatry and has experience working in outpatient, residential, and inpatient settings.

Dr. Masuda is dedicated to creating a safe, supportive, and nonjudgmental environment where patients feel heard and respected. He emphasizes open communication to establish clear treatment goals and expectations, ensuring patients are active partners in their care. His approach remains flexible, adapting as treatment evolves to best meet patient needs.

Dr. Masuda begins by gaining a thorough understanding of each patient’s history, concerns, and goals during the initial session. He then develops personalized treatment plans that align with those goals, integrating both medication management and therapeutic interventions. His balanced approach allows for individualized care tailored to support long-term recovery and overall well-being.

Xavier Diao, MD (he/him) is a board-certified psychiatrist. He earned his undergraduate degrees in Psychology and Biological Sciences at the University of Maryland, where he also obtained his medical degree. Dr. Diao completed his psychiatry residency at the Icahn School of Medicine at Mount Sinai, received additional training in child and adolescent psychiatry at Columbia and Cornell, and finished a psychoanalytic fellowship at the New York Psychoanalytic Society & Institute. Prior to joining Talkiatry, he was an Assistant Professor of Clinical Psychiatry at the University of Pennsylvania, where he provided clinical care and teaching along the undergraduate-graduate medical education continuum.

Dr. Diao's therapeutic orientation is informed by psychodynamic, cognitive behavioral, and dialectical behavior modalities. He has expertise in the treatment of a diverse range of mental health conditions, including depression, anxiety, OCD, and PTSD. Dr. Diao uses a developmentally informed and LGBTQ-affirmative approach in his practice, with the aim of enriching meaning and alleviating suffering in the domains of work, play, and love.

Dr. Diao begins each encounter with gentle curiosity, inviting patients to share their stories without fear of judgment. Together, he crafts an individualized treatment plan with the patient that may include medication, psychotherapy, and/or referrals to subspecialty care, always in close collaboration with other members on the treatment team.

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