Leslie Davis, LCSW

Dr. Rachel Sherhart is a board-certified adult psychiatrist who has been in practice for over 4 years. She specializes in medication management with 30-minute follow-up visits. This may be accompanied by elements of supportive therapy, Acceptance and Commitment Therapy (ACT), Dialectical Behavior Therapy (DBT), and psychodynamic therapy. If more in-depth work is needed, she may refer patients to a collaborating psychotherapist. ‍Dr. Sherhart received her medical degree from Texas A&M Health Science Center and completed her psychiatry residency training at the University of Texas Southwestern in Dallas, Texas. She has served as faculty at Texas A&M University College of Medicine, providing education and supervision for psychiatry residents and medical students. ‍She has experience treating adult patients from many walks of life with a broad range of diagnoses, including depression, anxiety, bipolar disorder, ADHD, and trauma-related disorders. Dr. Sherhart has a passion for providing excellent patient care and education. Her goal is for patients to feel heard and find a safe place to discuss their concerns. She is motivated to work collaboratively with patients to find a solution that best fits their treatment goals and improves their overall quality of life.‍

Mariah Ide is a Licensed Clinical Mental Health Counselor who has a passion for helping people see their true potential. Mariah earned her master's degree in mental health counseling from Stetson University in Deland, Florida, and also graduated with a bachelor's degree in psychology and criminology from the University of Florida located in Gainesville, Florida. Mariah has experience with children, adolescents, and adults. Mariah has worked in school, hospital, and outpatient based settings. She has clinical practice experience with mood disorders, self esteem issues, gender identity, crisis intervention, family issues and trauma, with a certification in complex trauma. In addition to counseling, Mariah has also worked in case management and has a unique perspective behind resource utilization. She has worked on countless projects in the community to promote mental health awareness. Mariah believes in advocacy for her clients as well as the mental health field, and hopes to promote acceptance and decrease stigma related to mental health and mental health treatment. Mariah takes a person-centered approach with her clients and believes in meeting the clients where they are. Mariah hopes to empower her clients by giving them a safe environment to explore and learn more about themselves without judgment. She sees the importance in looking at the whole picture when working with a client. Mariah hopes to create rounded goals to promote long term success, and help the client feel more balanced overall. She uses solution focused and cognitive behavioral interventions to help clients build a tool box of skills that can help them cope with daily life. Mariah wishes to help her clients reach their full potential, while hopefully making them laugh once in a while during the process.

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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America Calderon is a bilingual, National Certified Counselor (NCC), Licensed Mental Health Counselor in the state of New York with experience providing services for children, adolescents, and adults. America specializes in the treatment of anxiety, depression, trauma, adjustment disorders, life transitions, stress management, and other comorbid disorders. She holds a BA in Psychology from the University of Central Florida and a MSEd. in Clinical Mental Health Counseling from St. John's University in New York. America provides patients with a genuine, nonjudgmental, and supportive environment to help empower them and recognize their potential. She utilizes various treatment modalities which include Cognitive Behavioral Therapy, Motivational Interviewing, Mindfulness, and Relational-Cultural Therapy techniques. She practices from a person-centered and multicultural approach to build a meaningful, therapeutic relationship. Prior to becoming licensed as a psychotherapist, America was an educator in the state of Florida and New York with over 5 years of experience in the field. She is passionate about providing psychoeducation as it increases our insight into various mental health issues.

Renee is a licensed therapist in the states of Texas and Florida. She earned a Master’s degree in Counseling from Sam Houston State University. Renee brings 15 years of experience in the mental health field supporting adults, adolescents, and children across a diverse range of therapeutic needs in the private practice and school setting.

Renee is dedicated to helping clients navigate life's complexities with confidence and resilience. Renee provides a safe, empathetic space where clients can explore their challenges and discover their inner strength.

Drawing from evidence-based practices, such as Cognitive Behavioral Therapy, Renee partners with clients to develop practical coping strategies, foster self-awareness, and build emotional resilience. Whether you're facing anxiety, depression, trauma, ADHD, or life transitions, Renee is here to support your journey toward wellness. She believes in building on your existing strengths while developing new tools to help you thrive, not just survive.

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Dr. John Hendrick is a practicing psychiatrist who has recently served as medical director for clinical services at Erlanger Behavioral Health Hospital in Chattanooga, TN. After several years of private practice, he had served as Chief of Inpatient Psychiatric Services and then as Chief of Psychiatry at Mountain Home VA Medical Center. During his time at Mountain Home VA he was also a Professor of Psychiatry at Quillen Medical School at East Tennessee State University where he taught General Psychiatry courses and the Neurosciences of Psychiatry. His specialties include affective and anxiety disorders and he has specific expertise in neuropsychiatry, psychopharmacology and alternative treatments for affective disorders. He is a Distinguished Life Fellow of the American Psychiatric Association and is a Past President of both the Tennessee Psychiatric Association and the Southern Psychiatric Association. He has been awarded a Distinguished Service Award from the United States Public Health Service. He has been twice named the Outstanding Teacher Award from the ETSU Psychiatry Residency program and was awarded Course Director of the year for the Neurosciences residency course he developed. He holds an Irma J. Bland Award for Excellence in Psychiatric Education from the APA. He has an extensive psychiatric background in practice and as a teacher. He practices psychotherapy from an Eriksonian perspective and is well versed in individual and psychodynamic psychotherapies.