Jorge Corona, MD

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Dr. Jisoo Park is a board-certified psychiatrist. She obtained her bachelor's degree from Tufts University, where she double majored in Biopsychology and Art History. She attended medical school at Nova Southeastern University, and completed her psychiatry residency at Stony Brook University Medical Center. After graduating with her residency, she was appointed clinical assistant professor at Renaissance School of Medicine, where she worked at the Treatment Resistant Depression Clinic. She was involved in teaching medical students and residents, and was part of various research studies and publications. Dr. Park treats a variety of psychiatric disorders in adults, including depression, anxiety, and PTSD. She does not treat patients with ADHD. She emphasizes a patient-centered approach and believes that best treatment outcomes result from a strong therapeutic relationship between a patient and a psychiatrist. She offers medication management and therapy through telehealth sessions. She offers sessions in both English and Korean.

Mark Helms, MD

Staff Psychiatrist

Dr. Helms is a graduate of the University of Arizona College of Medicine. He completed his General Psychiatry and Child/Adolescent fellowship training at the University of Texas, Health Science Center at San Antonio. He has over 25 years of experience as a psychiatrist treating patients of all ages (child, adolescent, and adult�including geriatric) while working in a multitude of treatment settings including outpatient clinics and psychiatric hospitals. He also has several years of experience working as a psychiatric consultant for medical-surgical hospitals, seeing an extensive variety of patients on all floors of the hospital from mother-baby to pediatrics, as well as adult patients on the medical and surgical floors. Dr. Helms takes with him into each patient encounter, his wide breadth of experience and his genuine care and concern for each and every individual patient. He provides both medication treatment and talk therapy. He understands that many patients greatly benefit from either short or long term medication treatment; however, he also understands that talk therapy can oftentimes lead to significant, long lasting positive change, personal growth, and improvements in occupational and relationship success. Moreover, patients will always find Dr. Helms encouraging and supportive as they search for greater meaning and purpose in their lives.

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.

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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.

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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.

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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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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.

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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?

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Fang Yang, MD

Staff Psychiatrist

Background and credentials

Dr. Yang is board-certified in both General Psychiatry and Addiction Psychiatry. She received her medical degree from the Medical School of Nanjing University in China and completed her Ph.D. in Neuroscience at the State University of New York in Buffalo. She conducted neuroscience research at Tufts University and Columbia University. Dr. Yang completed her residency in Psychiatry at the University of Texas Health Science Center at Houston – McGovern Medical School (UTHealth) and a fellowship in Addiction Psychiatry at Baylor College of Medicine. She has held academic positions at Baylor College of Medicine, supervising medical students, residents, and physician assistant students.

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Treatment approach

Dr. Yang specializes in treating depressive disorders, bipolar disorders, anxiety, substance use disorders, ADHD, and trauma-related disorders. She employs medication management combined with supportive therapy and motivational interviewing techniques. Dr. Yang emphasizes building strong therapeutic relationships, tailoring treatment to each patient's unique goals and needs.

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What you can expect in a first visit

In the initial visit, patients can expect a detailed, personalized evaluation by Dr. Yang. She will explore symptoms, medical history, personal goals, and treatment preferences to design an individualized care plan. Patients can expect a compassionate, collaborative approach with clear communication about medication management options and supportive therapeutic strategies aimed at improving their overall well-being.

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Why Talkiatry?

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Angela Shields, MD

Chief Psychiatrist, Tennessee

Dr. Angela Shields is a board-certified adult psychiatrist with over 10 years of experience. Dr. Shields' clinical expertise includes treating adults with depression, anxiety, PTSD, and substance abuse. Dr. Shields' greatest passion is bringing healing and hope to those experiencing stress in their lives. Dr. Shields takes an evidence-based, whole health approach to patient care and believes in meeting you "where you are” on your road to recovery. Dr. Shields will welcome you with empathy and sincerity combined with a direct approach to treatment. Dr. Shields grew up in Gulf Breeze, FL. She obtained her Bachelor of Science from Cornell University, graduating Summa Cum Laude. She then completed the Medical Scientist Training Program at Vanderbilt Medical School, earning both her MD and her Ph.D. in Molecular Physiology and Biophysics. Her Ph.D. research focused on stress and its role in relapse to addiction. Following a four-year residency in Psychiatry at Vanderbilt Medical Center, Dr. Shields became board certified in both General Psychiatry and Addiction Medicine. Dr. Shields lives in Nashville, TN. She enjoys hiking, cycling, reading, puzzles, and travel.

Nida Khan, DO

Staff Psychiatrist

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.

Benjamin Joe Chambers, MD

Staff Psychiatrist

Dr. Benjamin Joe Chambers is a board-certified psychiatrist specializing in the treatment of adults. He has been practicing for 7 years. His practice focuses on medication management and brief psychotherapy for patients struggling with a wide array of psychological problems. For patients who need more intensive psychotherapy, Dr. Chambers works closely with a team of therapists who can step in and provide additional interventions. Dr. Chambers attended medical school at Texas A&M College of Medicine and completed his residency training at the University of Colorado in Denver. Having completed training, he returned to Austin, TX, and was an inpatient psychiatrist and Assistant Professor for Dell Medical School. He was extensively involved in resident physician education and helped run the medical school's primary inpatient mental-health training site throughout the Covid-19 pandemic. He was known amongst residents for his strong focus on utilizing psychotherapy to better understand and treat patients regardless of the treatment setting. Dr. Chambers treats adult patients, with a special focus on mood disorders, anxiety, trauma, and interpersonal conflict.‍

Michelle Shya, LCSW

Staff Licensed Clinical Social Worker

Michelle Shya, Licensed Clinical Social Worker (LCSW) at Talkiatry, has provided care in the field for almost a decade. Working with individuals and families, she has connected and fostered ties with a broad spectrum of clients, including adolescent, adult, and geriatric services. Michelle's practice style centers on providing a safe and understanding space for clients to share, learn, identify, and address their unique therapeutic needs. Using cognitive behavioral therapy (CBT), Michelle focuses on the relationships between thoughts, emotions, and behaviors to assist the client in discovering their personal strengths and motivation to realize their individual life goals. Michelle completed her undergraduate Social Work education at Millersville University. Later at Marywood University, she earned her Master's in Social Work, with a specialization in Child and Family Practice. Michelle has had a wide variety of experiences working as a Social Worker in therapeutic and social service settings. She has provided case management and therapeutic care in domestic violence shelters, treatment foster care, community organizations, and hospice in-home support. In Michelle's experience in providing therapy, she has maintained a generalist practice, working with a variety of individuals facing personal barriers and challenges. By taking a step-by-step therapeutic approach, the client is able to better understand and process their thoughts as well as feelings to drive actionable change.

Lisha Jones, LCSW

Staff Therapist

Lisha Jones is a licensed clinical social worker with over 23 years of extensive experience working in the mental health field. Lisha has worked with clients facing a variety of life's challenges such as anxiety, depression, trauma, as well as perinatal and postpartum mental health. She attended undergraduate school in Albany, GA, and graduate school in Valdosta, GA. Lisha is deeply committed to creating a safe, non-judgmental space where clients can express their thoughts and feelings freely. Lisha's approach to therapy involves engaging each client with warmth and enthusiasm. She encourages them to be active participants on their journey of emotional growth, healing, and empowerment. Lisha uses therapeutic expertise and various inner-healing approaches to teach clients restorative self-care practices, exercises that cultivate emotional awareness, strategies to manage unhealthy thoughts, and methods to change undesirable behaviors. Working with Lisha, clients can expect to take away from each session a plan of action with detailed steps, easy to apply skills and practical strategies to help them manage stress, heal from hurtful experiences, improve their communication skills and strengthen boundaries in their relationships. They will gain a better understanding about how and why they feel uncomfortable emotions and why they experience strong reactions in response to those associated thoughts.

Mary Stephenson, MD

Staff Psychiatrist

Dr. Mary Stephenson is a board-certified Child and Adolescent Psychiatrist with more than 25 years of clinical experience working with this population. Dr. Stephenson's practice focuses on medication management. She believes that the support and involvement of the family are an integral part of the treatment of the client. Additionally, more therapy support may be needed on occasion, and the recommendation to bring a psychotherapist on the care team may occur to provide an optimal outcome. She received her medical degree from Wright State University in Dayton, Ohio. She completed her psychiatry residency at the University of Louisville School of Medicine, and her child and adolescent training at the Bingham Child Guidance Center, also part of the University of Louisville, in Louisville, Kentucky. After completion of her training, she moved to Colorado where she worked at The Cleo Wallace Center, in Westminster, CO, providing care for hospitalized youth, and clients in the Day Treatment and Residential setting. In 2000, Dr. Stephenson became the primary Child and Adolescent Psychiatrist on the outpatient team at Denver Health Medical Center in Denver, Colorado. Her role was providing diagnostic evaluations, and medication management in Federally Qualified Health Centers (FQHCs), and the hospital clinic, working closely with residents, child fellows, and other trainees. She had an academic appointment through the University of Colorado School of Medicine. She treated a varied demographic and had a wide range of diagnoses in the child and adolescent population. From 2016-2021, she worked at Intermountain Health Center in Tucson, AZ providing care in the outpatient setting of the community mental health center. The care was a hybrid model of "in-person” and Telehealth treatment of children and adolescents with various disorders, with an emphasis on diagnostic evaluations of Autism and Autism spectrum disorders.‍

Sarah Mennella, MD

Staff Psychiatrist

Dr. Mennella is a board-certified adult psychiatrist. Her practice focuses on medication management and supportive therapy. Treatment emphasizes patient education and autonomy. Dr. Mennella is a proponent of shared decision-making and believes this facilitates a strong therapeutic relationship, greater satisfaction with care, and improved clinical outcomes. She completed an undergraduate degree in Information Technology from Purdue University and a master's degree in information systems from DePaul University. She received her medical degree from the University of Toledo College of Medicine and then completed her psychiatry residency at Loyola University Medical Center. Areas of interest include depression, bipolar, anxiety, and PTSD.

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Jorge Corona, MD

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Jisoo Park, DO

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Mark Helms, MD

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Nilesh Tannu, MD

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Matthew Koller, MD

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Fang Yang, MD

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Angela Shields, MD

Chief Psychiatrist, Tennessee

Nida Khan, DO

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Benjamin Joe Chambers, MD

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Michelle Shya, LCSW

Staff Licensed Clinical Social Worker

Lisha Jones, LCSW

Staff Therapist

Mary Stephenson, MD

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Sarah Mennella, MD

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