Lisa Carroll, LCSW

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. Richard Shehane completed medical school at the University of Nevada School of Medicine and then went on to complete psychiatry residency training at Naval Medical Center San Diego. Dr. Shehane is a board-certified psychiatrist that specializes in the treatment of depression, anxiety, PTSD, bipolar disorder, schizophrenia, personality disorders and ADHD. Dr. Shehane has also worked extensively with patients that have experienced sexual trauma in their past and patients struggling with substance and alcohol use addictions.

Dr. Shehane will focus on two main approaches to mental health treatment: medication management and psychotherapy. Appointments will focus on a mix of interactions aimed at tailoring each patient’s specific medication needs as well as promoting mental health wellness through different types of evidence-based therapy techniques including mindfulness, CBT, CPT and psychodynamic psychotherapy.

Dr. Shehane works together patients to develop a plan that fits each patient’s individual needs. Initial appointments will focus on identifying and treating primary concerns, and then later appointments will center on building upon the therapeutic relationship to increase self-awareness, promote emotional insight, and secure lasting positive mental health changes.

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Dr. Nida Khan is a board-certified psychiatrist starting her post-graduate practice with Talkiatry. She completed her undergraduate degree in Biochemistry at Smith College, earned her medical degree at New York Institute of Technology College of Osteopathic Medicine and completed her psychiatry residency training at Northwell Health. During her residency, she was involved in resident leadership and education, serving as academic chief resident during her third year of training. Dr. Khan's practice focuses on a holistic, patient-centered approach. Her practice is rooted in evidence-based practices and focuses on providing medication management during 30-minute visits along with supportive therapy to meet the unique needs of individuals under her care. Occasionally, she may believe that additional therapy is needed and may recommend a therapist be brought into your care team for optimal care.

Karen Tonner, MSN, PMHNP-BC is an ANCC board-certified Psychiatric Mental Health Nurse Practitioner with over eight years of experience providing psychiatric care in outpatient and community mental health settings. She works with patients across the lifespan and treats a broad range of mental health conditions, including depression, anxiety disorders, attention-deficit/hyperactivity disorder (ADHD), obsessive-compulsive disorder (OCD), and post-traumatic stress disorder (PTSD).

Karen primarily provides medication management in conjunction with supportive therapy, using evidence-based practices to help patients achieve symptom relief and improved functioning. Her approach to care is holistic, person-centered, and collaborative, emphasizing shared decision-making and individualized treatment planning. She strives to create a welcoming, approachable, and supportive environment where patients feel comfortable being themselves and actively participating in their care. She believes that understanding each patient’s unique experiences, goals, lifestyle, and strengths is essential to effective mental health treatment.

Karen earned her Bachelor of Science in Nursing from Kennesaw State University and her Master of Science in Nursing from the University of Alabama at Birmingham. She is dedicated to continuing education to remain current with psychiatric research and is committed to delivering compassionate, high-quality care that helps patients feel heard, respected, and empowered.

Paul Pennington is a Licensed Professional Counselor with over 15 years of mental health experience in a variety of settings ranging from schools, private practice, residential facilities, and crime scene crisis counseling. Paul has had the privilege of helping people with various situations including depression, anxiety, stress, anger, trauma, abuse, life transitions, relationships, integration, existential issues, and other obstacles that have caused an imbalance in their lives. Paul specializes in working with teachers, first responders, young parents, and individuals that just want to be seen as who they truly are.‍Paul earned a Bachelor of Science in Psychology with a minor in Sociology from Texas State University and a Master of Education in Guidance and Counseling from Angelo State University. A few of the certifications Paul has earned over the years are: Residential Staff from the Texas Department of Criminal Justice, Certified Anger Resolution Therapist (C.A.R.T.), AgriSafe Farm Response, Trust Based Relational Intervention (TBRI) Practitioner Trainer, Texas Education Agency: EC-12 SpEd, 4-8 Generalist, EC-12 School Counselor, SAFE EMDR, Mental Health First Aid, and Ketamine Assisted Psychotherapy.‍Paul believes everyone is different and takes an individualized approach with each client. He operates from a foundation in Cognitive Behavioral Therapy, Trust-Based Relational Intervention, Solution Focused Therapy, and Mindfulness.

Megan is a Board-Certified Psychiatric Mental Health Nurse Practitioner specializing in medication management and various therapeutic techniques. She earned a Master of Science in Nursing as a Psychiatric Nurse Practitioner from Regis College and has board certification from the American Nurses Credentialing Center (ANCC).

Megan has extensive experience in psychiatric settings, including private practice, inpatient facilities, and substance use treatment programs. She has worked on community initiatives, such as the Mobile Suboxone Van program, which provides treatment to individuals in high-need areas.

She utilizes evidence-based practices in treating clients with mood and anxiety disorders, ADHD, trauma, and substance use disorders, among other mental health disorders.

The first priority is establishing a therapeutic relationship and providing adequate support, which can substantially impact outcomes. The combination of medication management and therapy can effectively reduce symptoms and contribute to the remission of mental health symptoms.

The first session will involve a 60-minute psychiatric evaluation to gather history and discuss current symptoms and goals. Clients starting medication will need more frequent 30-minute follow-up appointments for medication management and therapy, ensuring a positive response to treatment.

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