Miranda Morgan, DO

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Christa DeFries, MD

Staff Psychiatrist

Background and credentials

Dr. Christa DeFries is a board-certified Adult Psychiatrist. She earned her medical degree from UT Southwestern Medical School in Dallas, Texas, and completed her residency in Adult Psychiatry at Baylor Scott & White in Temple, Texas. Following residency, Dr. DeFries gained additional experience treating homeless and formerly homeless populations in New York City, particularly focusing on individuals with histories of trauma and substance addiction, prior to joining Talkiatry.

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Treatment approach

Dr. DeFries practices Adult Psychiatry, employing an integrative treatment approach combining medication management, psychotherapeutic methods, and lifestyle modifications. She recognizes that each patient benefits from a personalized mix of these three aspects of care. Dr. DeFries specializes in treating diverse psychiatric conditions, including those related to trauma, substance addictions, and various mental health disorders.

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What you can expect in a first visit

In a first visit with Dr. DeFries, patients can expect a comprehensive evaluation aimed at understanding their individual mental health history, specific concerns, and overall treatment goals. Dr. DeFries emphasizes an individualized approach, carefully exploring the best combination of medication, therapy, and lifestyle adjustments tailored specifically to each patient's needs. Patients can anticipate an empathetic and collaborative environment focused on their personal experiences and goals.

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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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Gregory Miller, DO

Staff Psychiatrist

Gregory Miller, DO, is an adult psychiatrist who prioritizes understanding his patients by first listening to their stories. He collaborates with them to develop both pharmacological and non-pharmacological solutions aimed at improving their functionality. Dr. Miller emphasizes that functioning better often leads to feeling better. Whenever possible, he approaches treatment within the context of the family system surrounding the individual. Raised in South Carolina, and now residents of Florida, Dr. Miller and his wife of 31 years have six children. He enjoys outdoor activities and team sports and is an avid fan of Tolkien and C.S. Lewis. He at times incorporates analogies from their works into therapy if appropriate.

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Diane Lewis, MD

Staff Psychiatrist

Background and credentials

Dr. Diane Lewis is board-certified in general psychiatry by the American Board of Psychiatry and Neurology. She earned both her undergraduate and medical degrees at Texas A&M University (College Station and Temple, TX) before completing her general psychiatry residency at UT Southwestern - Austin Programs (now Dell Medical School residency programs). After her residency, she practiced for eight years as a staff psychiatrist at the University of Texas' student counseling center. She also has experience working in hospital admissions and emergency department settings.

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Treatment approach

Dr. Lewis employs a medication-management-focused approach typically paired with supportive therapy during 30-minute follow-up visits. She strongly values a collaborative treatment approach, frequently encouraging patients to incorporate additional therapy for the best outcomes. Her primary specialty is college mental health, treating patients aged 18-45 with a range of mental health conditions from mild to complex. Dr. Lewis emphasizes authenticity, compassion, and recognizing patients beyond their diagnoses, providing care tailored to individual circumstances and goals.

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What you can expect in a first visit

During a first visit, patients can expect Dr. Lewis to conduct a thorough evaluation, carefully listening to their concerns, and considering their symptoms within the broader context of their lives. Her patients appreciate her down-to-earth and compassionate communication style. She aims to create an environment where patients feel understood, respected, and actively involved in shaping their personalized treatment plan, often recommending additional therapy support when beneficial for achieving optimal outcomes.

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Why Talkiatry?

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Jennifer Yen, MD

Staff Psychiatrist

Dr. Jennifer Yen is a double board-certified child, adolescent, and adult psychiatrist who has practiced in a variety of settings, including private, community, and academic medicine. She obtained her medical doctorate and general psychiatry residency at the University of Texas Medical School at Houston before completing her child and adolescent psychiatry fellowship at Baylor College of Medicine. She is currently a Clinical Professor of Psychiatry and Behavioral Sciences at Baylor College of Medicine and has authored multiple peer-reviewed publications on pediatric mental health. Dr. Yen is also a Distinguished Fellow of the American Academy of Child and Adolescent Psychiatry and has been on the editorial board of Clinical Psychiatry News. Dr. Yen believes in a collaborative treatment approach that includes use of pharmacology, therapeutic interventions, and support networks. While versed in a broad range of mental disorders, she is most passionate about anxiety, depression, minority mental health, and acculturation and intergenerational conflicts. She enjoys finding creative ways to address ongoing treatment issues, and utilizes digital media in the treatment setting.

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Keri Lemmond, MD

Staff Psychiatrist

Dr. Keri Lemmond is a board-certified adult psychiatrist with over 25 years of experience. Her practice focuses on medication management and ongoing supportive therapy during a 30-minute follow-up visit. Dr. Lemmond is a graduate of the Texas A&M Health Science Center and completed her residency training in adult psychiatry at Warren Alpert Medical School of Brown University. She previously held a faculty position with the University of Colorado School of Medicine and was a staff member at the Colorado State University Health Network. ‍In addition to her work with young adults in the college setting, she has had additional experience working with adults with co-occurring ADHD, substance use, PTSD, OCD, and premenstrual dysphoric disorder. Dr. Lemmond has been recognized for her approachable, empathic style when meeting individuals for the first time and throughout their work together. When necessary, she will recommend specific therapy modalities with a collaborating therapist for the best outcome. In her free time, Dr. Lemmond enjoys spending time with her family, traveling, and gardening.

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Rachel Sherhart, MD

Staff Psychiatrist

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.‍

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Other Clinicians

Susan Kim, MD

Staff Psychiatrist

Dr. Susan Kim is a board certified psychiatrist who was born and raised in Queens, NY. She has spent much of her time in the North East and is currently residing in New Jersey with her spouse and dog, Luna. Dr. Kim began her medical training at Temple University in Philadelphia and completed her psychiatric residency at Stony Brook University Hospital, where she was chief resident for her final year. She has worked in numerous psychiatric roles. This includes working at a Comprehensive Psychiatric Emergency Program (CPEP) at Stony Brook University Hospital, as well as the inpatient voluntary psychiatric unit at Holy Name Hospital. She has also worked as a psychiatric consultant for patients admitted to medical-surgical units at Holy Name Hospital. Dr. Kim is well versed in medication management, particularly for depression, anxiety, as well as psychotic disorders. Her treatment style includes several psychotherapeutic techniques, including supportive, cognitive behavioral, and psychodynamic, based on her patient's needs and preferences. She also holds a special interest in cultural psychiatry as well as relational intelligence.

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Michelle Zaydlin, MD

Staff Psychiatrist

Dr. Michelle Zaydlin is a board-certified psychiatrist who has experience in caring for diverse patient populations presenting with an array of diagnoses. Her interests include neurodevelopmental disorders (autism, ADHD), mood disorders, anxiety, trauma, and comorbid medical conditions. She has completed internships in pediatric neuropsychology and worked as a behavior therapist, delivering Applied Behavior Analysis (ABA) therapy, enriching her understanding of development and neurocognitive functioning. Additionally, Dr. Zaydlin actively participates in research and is actively engaged in educational initiatives for other healthcare providers. Dr. Zaydlin believes in a collaborative and compassionate approach to mental health care. She works with patients across their lifespans, integrating psychopharmacology and psychotherapy. She integrates cultural sensitivity with evidence-based practices to provide individualized, holistic care. Her empathetic approach and clinical knowledge enable her to foster meaningful connections with her patients and facilitate positive treatment outcomes.

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Taiane Ferrari, MD

Staff Psychiatrist

Dr. Ferrari is a highly regarded psychiatrist with a strong background in both clinical practice and research. She attended NYU School of Medicine and completed her residency at the University of Tennessee. She is an expert in treatment-resistant depression, anxiety and adult ADHD. She is dedicated to providing patient-centered, evidence-based care with a holistic and compassionate approach. As a mother of three, including a son with autism, Dr. Ferrari is particularly passionate about the complexities of women's mental health. Patients often describe her as caring, knowledgeable, compassionate, and insightful. In addition to English, Dr Ferrari also speaks Portuguese and Spanish.

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Barbara Lampert, MD

Staff Psychiatrist

Dr. Barbara Lampert is a board certified psychiatrist, diplomat of The American Board of Addiction Medicine, and Fellow of the American Society of Addiction Medicine. She trained at the Downstate School of Medicine in Brooklyn, NY, completed her internship at Georgetown University in Washington, DC, and her residency in Psychiatry at the David Geffen School of Medicine at UCLA in Los Angeles. Over 30 years, she has worked in inpatient and outpatient settings, taught 3rd-year residents psychopharmacology in the Mood Disorder clinic she created, consulted in the prison system, and volunteered in the aftermath of natural disasters. She joined the New Mexico Medical Reserve Corps and was active in the Corps while working in her private practice. She continued to study the effects of trauma when she returned to California in 2008. She received specialized training in EMDR and Dialectic Behavior Therapy. In addition, she studied substance abuse problems and became a Diplomate of the American Board of Addiction Medicine. Empathy forms the core of Dr. Lampert's approach to treating patients. Working with trauma survivors, she believes that the goal is not to dwell on "the story” because patients often need time to reconstruct an accurate history. Rather, helping patients manage the challenge of living in the present moment is a worthy goal. Dr. Lampert has been named one of the Best Doctors in America for the treatment of mood disorders and one of the Best Doctors in California. She has remained dedicated to the dual path she's followed for years: excellence in Biological Psychiatry and psychology. She looks forward to working with you to help you achieve your treatment goals.

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Greg Morgan, MD

Staff Psychiatrist

Dr. Greg Morgan is a board-certified psychiatrist. He completed his undergraduate training at the University of Toronto, followed by medical school at the Jacobs School of Medicine at the University at Buffalo. He completed his psychiatric residency at the Icahn School of Medicine at The Mount Sinai Hospital, where he acted as Chief Resident. Dr. Morgan has a keen interest in treating patients with a wide range of disorders: depression, anxiety, bipolar disorders, personality disorders, trauma-related illnesses, ADHD, and obsessive compulsive disorders. Dr. Morgan also has expertise in providing psychodynamic psychotherapy, an attitude he brings to all of his patient visits. He completed the Intensive Psychoanalytic Psychotherapy program at the William Alanson White Institute in New York City. He aims to use this knowledge to better understand the subjective experience of his patients in order to provide them with the most caring and effective treatment possible.

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Jennifer Garner, PMHNP

Staff Psychiatric Nurse Practitioner

Jennifer Garner is a board-certified Family Psychiatric Nurse Practitioner with Talkiatry. She obtained a Bachelor of Science in Nursing from the University of Tennessee, Knoxville, in 2009 and a master's degree from Vanderbilt University in 2011. Jennifer enjoys treating all adults and has outpatient experience with community mental health, corrections, and private practice. Besides outpatient care, she has worked in crisis stabilization and ambulatory detox for adults with primary psychiatric and dual diagnosis illnesses. Jennifer is skilled in treating a wide range of conditions including ADHD, bipolar disorder, substance misuse, anxiety, OCD, and PTSD. She is committed to fostering a welcoming and inclusive environment, ensuring all gender identities feel safe and respected. With a focus on patient-centered care, her approach is carefully tailored to each person's individual needs and goals, promoting a collaborative therapeutic relationship. During appointments, she combines medication management with therapy techniques to empower patients with the skills for their well-being. Appointments are as unique as each individual that she meets with. If you're ready (and even if you're not so sure) take the first step and let's talk.

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Miranda Morgan, DO

Education and training

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