Brett Abernethy, MD

Staff Psychiatrist
Languages
English
Conditions Treated
ADHD
Anxiety
Bipolar Disorder
Depression
Obsessive-compulsive disorder (OCD)
PTSD/Trauma
Tics/Tourette Syndrome

Education and training

• Emory University, BS

• University of Texas Medical School at Houston, Doctor of Medicine, MD

• University of Texas Southwestern Medical Center, Internship

• University of Oklahoma Health Sciences Center, Residency

Get to know

Brett Abernethy, MD

Background and credentials    

Dr. Abernethy is a board-certified psychiatrist who received his medical  degree from the University of Texas Medical School at Houston. He completed  his internship at UT Southwestern in Dallas and earned a Master's of Public  Health in Epidemiology and Occupational and Environmental Health from Texas  A&M. He completed his psychiatry residency training at the University of  Oklahoma Health Science Center. Dr. Abernethy has over 12 years of experience  practicing psychiatry in various outpatient settings, including private  practice and community mental health centers in Texas and Oklahoma,  specifically reaching underserved communities. He has treated a broad  spectrum of mental health symptoms among diverse populations, addressing  issues ranging from mood and anxiety disorders to behavioral manifestations  of Autism and other developmental disorders.    

Treatment approach    

Dr. Abernethy utilizes a collaborative and patient-centered approach to  psychiatry, focusing primarily on medication interventions that align with  each patient's unique treatment goals and clinical needs. He emphasizes  cooperation with patients to effectively treat and reduce mental  health-related symptoms. His practice centers around medication management,  supplemented by supportive treatments tailored to individual needs. Depending  on each patient’s circumstances, he may recommend additional support from  individual, family, or group counselors and therapists to achieve optimal outcomes.    

What you can expect in a first visit

In an initial visit, patients can expect a thorough, collaborative  discussion focused on understanding their symptoms, goals, and clinical  needs. Dr. Abernethy will evaluate the patient's condition to determine  appropriate medication interventions and discuss personalized treatment  recommendations. Typical follow-up visits are approximately 20-30 minutes in  length. Depending on the severity and complexity of a patient's situation,  referrals to additional counseling or therapy may also be suggested.    

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 speciualize in  medication management and collaborate with you on a treatment plan that fits  your needs and comfort level.

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Nilesh Tannu, MD

Staff Psychiatrist

Background and credentials

Dr. Nilesh Tannu is a board-certified psychiatrist by the American Board of Psychiatry and Neurology. He earned his medical degree from B.J. Medical College in Pune and completed his adult psychiatry residency at the University of Texas Medical School at Houston, where he served as chief resident. During his training, he received awards from the Society of Biological Psychiatry, the American Academy of Addiction Psychiatry, and the American Psychiatric Institute for Research and Education. He has been practicing General Psychiatry and Consultation-Liaison Psychiatry for the past seven years at Texas Medical Center in Houston, Texas. Additionally, he has served as an assistant professor of psychiatry at the Texas Medical Center, working at UT Physicians Clinics and Memorial Hermann Hospital. He is also a member of the Editorial Board for BMC Genomics Journal.

Treatment approach

Dr. Tannu follows the bio-psycho-social model to provide evidence-based psychopharmacologic treatment. He integrates supportive therapy and cognitive-behavioral therapy (CBT) modalities into his practice to create personalized and comprehensive treatment plans. He is committed to mental health care, education, and helping patients achieve optimal functioning in their personal and professional lives. His clinical expertise includes ADHD, anxiety disorders, depressive disorders, bipolar disorder, psychotic disorders, insomnia, eating disorders, and complex medical comorbidities.

What you can expect in a first visit

During the first visit, patients can expect a comprehensive assessment where Dr. Tannu takes the time to understand their symptoms, treatment history, and personal goals. He employs a collaborative approach to develop a tailored treatment plan that may include medication management and therapy interventions. His focus is on evidence-based care, ensuring that patients receive treatments that are scientifically backed and aligned with their individual needs.

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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Matthew Koller, MD

Staff Psychiatrist

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.

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.

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.

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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John Ewing, MD

Staff Psychiatrist

Dr. Ewing is a board-certified psychiatrist who did his undergraduate degree at the University of Texas in Austin, Texas, and then completed his medical training at the University of Texas, in Houston, Texas, where he was inducted into the AOA honor society. After a medical internship in Seattle, he did his psychiatric residency at the University of California, San Diego where he was chief resident. He went on to complete a child and adolescent fellowship at Columbia University in New York, where he was also chief resident, and earned additional board certification in addiction psychiatry.

Over the past twenty plus years, Dr. Ewing has worked with adolescents, adults and families as the Director of Psychiatry at the Wellspring Foundation, a residential treatment facility in Connecticut, where he spent his time treating patients and supervising therapists. For more than a decade he taught Child and Adolescent Psychiatry residents at Columbia University, and has been in private practice in New York and CT. The length of his experience helps him in understanding the treatment of bipolar disorder, major depression, OCD and anxiety disorders, as well as substance use disorders and eating problems and how they evolve over time. He is an expert in the medical management of these disorders. He is a careful listener and a real person, with a wry sense of humor.

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Lillian Cole, MD

Staff Psychiatrist

Background and credentials

Dr. Lillian Cole is a board-certified adult psychiatrist. She completed her undergraduate education at the University of North Carolina Wilmington and went on to earn both a master’s in biomedical sciences and a medical degree from Texas Tech University. She completed her psychiatry residency training at the University of Texas Southwestern Medical Center, where she gained experience working with a diverse range of patient populations across different ethnic, socioeconomic, and clinical backgrounds.

Treatment approach

Dr. Cole emphasizes a holistic, patient-centered approach that integrates evidence-based medicine, psychotherapeutic techniques, lifestyle interventions, and psychoeducation. She believes that listening, collaboration, and compassion are essential to guiding patients toward recovery. Her practice primarily focuses on psychiatric medication management, and she has extensive experience treating mood disorders, anxiety, trauma-related disorders, and substance use disorders. When additional therapy is necessary for the best outcome, she may recommend integrating a therapist into the treatment plan.

What you can expect in a first visit

Patients can expect a thorough and compassionate initial evaluation, where Dr. Cole takes the time to understand their symptoms, medical history, and treatment goals. She focuses on fostering a strong doctor-patient relationship and collaborates with each patient to create a personalized treatment plan that may include medication management, therapy, and lifestyle interventions. If additional therapy is indicated, she will coordinate with other providers to ensure comprehensive care tailored to the patient’s needs.

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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Moni Baidya, MD

Staff Psychiatrist

Background and credentials

Dr. Moni Baidya is double board-certified in adult and geriatric psychiatry with over nine years of experience. She earned her medical degree from Manipal College of Medical Sciences and completed her psychiatry residency and geriatric fellowship training at the University of Virginia, Charlottesville. Her background includes work in nursing homes, acute rehabilitation centers, inpatient psychiatric units, and outpatient settings, providing care for diverse patient populations.

Treatment approach

Dr. Baidya strongly believes that developing a good therapeutic rapport is essential for successful treatment. Her practice primarily focuses on medication management, often combined with supportive, psychodynamic, cognitive-behavioral (CBT), and couple’s therapy in 20–30 minute follow-up visits. She takes a holistic approach, particularly for patients with complex medical conditions that impact emotional health, collaborating with interdisciplinary teams and family members when appropriate. In addition to general adult psychiatry, she specializes in geriatric psychiatry and women’s mental health, with a primary focus on treating women with mood and anxiety disorders and geriatric patients with newly diagnosed psychiatric conditions.

What you can expect in a first visit

During the first visit, patients can expect a comprehensive evaluation where Dr. Baidya takes the time to assess their symptoms, medical history, and treatment goals. She fosters a collaborative and supportive environment, ensuring that treatment plans are tailored to individual needs. Follow-up visits typically last 20–30 minutes, with a focus on medication adjustments and therapeutic support. If additional therapy is necessary, she may recommend integrating a therapist into the patient’s care team for the best possible outcome.

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.

View Bio ›

Amber Blue, MD

Staff Psychiatrist

Dr. Amber Blue is a board-certified psychiatrist trained in Adult Psychiatry. She completed her residency at Yale University. She offers medication management in 30-minute follow-up visits informed by her psychotherapy experience. Occasionally, she may believe additional therapy would be beneficial, and therefore, she recommends that you add a therapist to your care team for the best results. She has received specialized training in psychoanalytic psychotherapy at Columbia University and NYU. Over the past three years, Dr. Blue has worked in college student health centers and private practice. She has a wide range of experience in treating various mental illnesses including depression, bipolar disorder, anxiety, and OCD. Her approach is to educate clients on their mental health, available pharmacologic and psychotherapeutic options, and to collaborate with them in formulating an evidence-based treatment plan.

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Other Clinicians

Ashley Sharp, LPC/MHSP

Staff Therapist

Ashley Sharp is a Licensed Professional Counselor with Mental Health Service Provider designation, who has experience working in multiple settings within the mental health field including private practice counseling, school-based counseling, and in a behavioral health hospital. This has allowed Ashley to work closely with individuals of various demographics and a wide spectrum of mental health conditions. Ashley obtained her undergraduate degree in psychology from Bryan College in Dayton, TN, and her graduate degree in clinical mental health counseling from Richmont Graduate University in Chattanooga, TN. Ashley has been working in the mental health field for 4 years and focuses on mood and anxiety disorders, as well as personality disorders, challenges in relationship dynamics, and difficult life transitions such as grief and divorce. Ashley tailors her treatment modalities for the greatest benefit of the individual, being considerate of the background and needs of each client. Ashley uses an eclectic approach to therapy founded in Cognitive Behavioral Therapy and incorporates elements of Dialectical Behavior Therapy such as mindfulness, distress tolerance, and emotional regulation.

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Lisa May, LPC

Staff Licensed Professional Counselor

Lisa May is a licensed professional counselor and mental health service provider (LPC-MHSP) with extensive experience working in the mental health field. Lisa has worked with clients of various demographics who are living with a variety of mental health conditions. Lisa attended Lindsey Wilson College where she attained her Master's in Mental Health Counseling and Morehead State University where she graduated with a bachelor's degree in social work. She has worked with DCS, foster care, and had a private practice in KY before deciding to move to Tennessee. Lisa has been practicing for over 10 years and has worked in other areas of mental health since 1997. Working with Lisa, I found that treatment is tailored for the individual, as there is great effort put into choosing the treatment modality that fits the individual's personal struggles. Lisa uses the three C's (catching, checking, and changing) approach with a foundation in Cognitive Behavioral Therapy intertwined with Mindfulness. She also prefers the person-centered focus, as she works specifically with the individual and the struggles they may be facing.‍

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David Guggenheim, PsyD

National Director of Psychotherapy

Dr. David Guggenheim is an experienced clinical psychologist and health care administrator. He has worked with patients at different stages of life, including children, adolescents, and adults, and he has treated patients living with a wide range of mental health conditions, including anxiety, depression, post-traumatic stress disorder (PTSD), substance use, and attention-deficit hyperactivity disorder. Dr. Guggenheim has specific training in Trauma-Focused Cognitive Behavioral Therapy, Motivational Interviewing, and foundational training in dialectical behavioral therapy. Prior to joining Talkiatry, Dr. Guggenheim served as the Chief Behavioral Health Officer at Callen-Lorde Community Health Center in New York City, specializing in LGBTQ+ health care. In that role, he oversaw teams of providers including psychiatrists, psychologists, and social workers, who collectively provided care to thousands of patients in the New York metropolitan area. While at Callen-Lorde, he also served as co-chair for the behavioral health subcommittee of the Community Health Center Association of New York State; worked as an Adjunct Professor at Post University; and performed volunteer clinical work at the Weill Cornell Center for Human Rights. Before joining Callen-Lorde, Dr. Guggenheim worked as Associate Chief Behavioral Health Officer at Community Health Center, Inc., a federally qualified health center in Connecticut. A recognized expert, Dr. Guggenheim has delivered lectures to audiences ranging from medical schools to corporate executives, and he has been quoted in national media including The Advocate, Yahoo Finance, and Teen Vogue. Dr. Guggenheim has also been honored with an Early Career Achievement Award from the American Psychological Association in 2016. Dr. Guggenheim received his Bachelor of Arts from the University of Connecticut in 2002 and his Doctor of Psychology in Clinical Psychology from the American School of Professional Psychology at Argosy University/Washington, DC in 2009.

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Ekta Rathee, PMHNP

Staff Psychiatric Nurse Practitioner

Ekta Rathee, DNP, PMHNP-C, is an experienced psychiatric and mental health nurse practitioner with an extensive clinical background in a variety of patient care settings. Rathee's diverse clinical background has strengthened her belief in a holistic approach for optimal patient outcomes. Though her primary focus remains medication management of anxiety, depression, bipolar disorder, OCD, PTSD, ADHD, she equally supports and incorporates the principles of cognitive behavioral therapy, acceptance and commitment therapy, motivational interviewing and enhancement therapy, and supportive therapy in her daily patient care practice. Rathee truly believes in an individualized and holistic patient care approach, which requires a wealth of knowledge, experience, and a commitment to stay abreast of the latest in the field. Her favorite learning modality is to learn from unique patient care scenarios, which often requires a deep dive into the existing body of evidence-based knowledge. Her most important advice for her patients is to never lose hope.

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Leslie Davis, LCSW

Staff Therapist

Dr. Leslie Davis became a psychotherapist because she believes that mental health shapes and influences various aspects of life. Mental health is considered vital! She has been a Doctor of Social Work since 2021 and a Licensed Clinical Social Worker since 2019, with experience supporting children, adolescents, young adults, and adults with concerns such as trauma, substance abuse, intimate partner violence, depression, anxiety, PTSD, mood disorders, marital issues, and more. She has extensive experience in various settings including inpatient, outpatient, partial hospitalization (PHP), intensive outpatient (IOP), school settings, community-based settings, and emergency departments.‍Dr. Leslie Davis does not see her role as a therapist as needing to "save the world” or "empower” clients. Instead, she believes in working alongside clients to help them identify tools within themselves and community resources to successfully achieve their goals. The types of therapy offered include, but are not limited to, Cognitive-Behavioral Therapy (CBT), Culturally Sensitive Therapy, Dialectical Behavior Therapy (DBT), Motivational Interviewing, Multicultural Therapy, Person-Centered Therapy, and Solution-Focused Therapy. Alongside the use of evidenced-based practices and culturally informed care, Dr. Leslie Davis has developed a proven approach for helping clients (a) identify the root cause of their challenges and (b) create a tailored plan that leads to measurable progress.

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Tracey Griffin, LMHC

Staff Licensed Mental Health Counselor

Tracey Griffin is an LMHC and LPC who is dedicated to helping people align with their most authentic selves, holding credentials in NY, NJ, and FL. This includes addressing the struggles of mental health in an open, empathetic, and non-judgmental, therapeutic relationship. She is dedicated to establishing a collaborative working relationship with individuals to help achieve their goals while living a fulfilled and balanced life. Tracey received her Master of Science in Mental Health Counseling from Pace University, followed by her Bachelor of Arts in Applied Psychology from the same institution. She has been trained in performing biopsychosocial assessments and has an extensive history working as a Credentialed Alcohol and Substance Abuse Counselor exploring various approaches to recovery goals. Tracey's treatment approach is person-centered in conjunction with evidence-based practices such as cognitive behavioral therapy, dialectical behavioral therapy, mindfulness, and motivational interviewing while remaining culturally sensitive and inclusive. She is well versed in harm reduction as well as abstinence-based approaches to addiction treatment and roots her practice to focus on treating the whole self, which can include exploration of spirituality and purpose. Tracey has experience working with individuals who experience co-occurring disorders, anxiety, depression, codependency, addiction, personality disorders, LGBTQ, men's issues, and trauma.

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