Gregory Miller, DO

Dr. Mark Sundahl is a board-certified adult psychiatrist. He was born and raised in the suburbs of Kansas City, Kansas. He has always been fascinated by the natural world and received a bachelor’s degree in biology at Kansas State University where he was active in a research lab investigating protein function in the human body. He completed medical school training and residency at the University of Kansas School of Medicine in Kansas City, Kansas along with Wichita, Kansas. Dr. Sundahl has experience working with a broad range of mental health symptoms and a diverse patient population

Dr. Mark Sundahl is a board-certified adult psychiatrist. He was born and raised in the suburbs of Kansas City, Kansas. He has always been fascinated by the natural world and received a bachelor’s degree in biology at Kansas State University where he was active in a research lab investigating protein function in the human body. He completed medical school training and residency at the University of Kansas School of Medicine in Kansas City, Kansas along with Wichita, Kansas. Dr. Sundahl has experience working with a broad range of mental health symptoms and a diverse patient population

Dr. Sundahl understands the importance of collaboration and the therapeutic alliance when working with patients. He will clearly explain his findings and discuss treatment options he feels are reasonable. Dr. Sundahl thinks it is important for patients to have all the necessary information to make informed decisions when it comes to their psychiatric treatment.

‍

Dr. Alexandre is a board-certified psychiatrist who completed his psychiatry training both in Brazil and in the United States, where he served as Chief Resident in both programs. He is fluent in both English and Portuguese and is especially attuned to the unique challenges faced by international and immigrant populations. Dr. Alexandre is passionate about helping patients achieve meaningful and sustained improvements in their mental health.

He brings over a decade of experience in mental health care and has a strong foundation in evidence-based treatment. His clinical interests include mood and anxiety disorders, ADHD, and cross-cultural psychiatry.

Dr. Alexandre incorporates a collaborative and compassionate approach to care, combining medication management with elements of cognitive behavioral therapy, behavioral activation, and interpersonal strategies when appropriate.

‍

Dr. Jane Eisen comes to Talkiatry from her previous position at McLean Hospital, in Boston, where she was Clinical Director of the Depression and Anxiety Division, overseeing the integration of clinical work, faculty development, and research in the division. Clinically, she has experience working with people with significant mood and anxiety difficulties. Dr. Eisen's practice focuses on using an integrated approach to the understanding and treatment of individuals' psychosocial stresses and psychiatric symptoms. Her sessions are usually 30 minutes. She frequently suggests including a family member or friend in at least one session to get a comprehensive sense of each person's strengths and challenges. She received her medical degree from NYU and completed her psychiatric residency at Mt. Sinai Hospital. She spent a number of years in the Brown system, as Training Director for the Brown Psychiatry Residency and as Vice-Chair of the Brown Department of Psychiatry. For several years, she served as Chair of the Department of Psychiatry at Mt. Sinai West/St. Lukes' prior to her position at McLean, as Clinical Director of the McLean Hospital Depression and Anxiety Division. She has worked primarily with outpatients with the exception of a recent period of residential work at the Pavilion at McLean Hospital. Dr. Eisen is a general psychiatrist with a focus on anxiety disorders, OCD, and mood disorders. She is interested in the impact of trauma and personality and has extensive experience working with young adults.

Trudy Warner-Phillips, PMHNP, is a board-certified psychiatric nurse practitioner with over 25 years in nursing and 7+ years in psychiatric care. Her experience spans outpatient, inpatient, and telehealth settings, where she treats conditions such as anxiety, depression, PTSD, mood disorders, and ADHD. She is passionate about delivering thoughtful, evidence-based care in a supportive and accessible virtual environment.

Trudy’s approach is grounded in trust, respect, and collaboration. She values open, honest communication and aims to create a space where clients feel heard, safe, and empowered. By understanding each person beyond their symptoms, she tailors care to support individual challenges, strengths, and goals.

Initial sessions involve a thorough assessment of medical and psychiatric history, current concerns, and past treatments. Trudy then works with clients to develop a personalized care plan focused on their most pressing symptoms. Her treatment may include medication management, supportive therapy, and lifestyle recommendations to promote lasting emotional well-being.

Dr. Dennis Valerstain is a board-certified Adult and Child and Adolescent Psychiatrist. After completing his undergraduate education at Emory University, he attended medical school at the Northwestern University Feinberg School of Medicine. He subsequently completed psychiatry residency at University of Miami/Jackson Health System and further sub-specialized at University of Miami/Jackson Health System with a fellowship in Child and Adolescent Psychiatry. Dr. Valerstain has had the opportunity of working with a diverse array of patients including children, adolescents, the severely mentally ill, veterans, and cancer patients across three distinct hospital systems. Dr. Valerstain has had varied clinical experiences in specialty inpatient psychiatry units, emergency psychiatry, consultation liaison psychiatry, psycho-oncology, and outpatient clinics via telemedicine and face to face interactions. Dr. Valerstain has experience working with patients of all ages, particularly those with depression, anxiety, bipolar disorder, ADHD, Tic disorders, substance use disorders, and more. Dr. Valerstain's practice focuses on medication management and also employs empathic listening, supportive psychotherapy techniques, and a comprehensive and methodological approach to his visits. Given his broad and diverse training experiences, he enjoys problem solving and working collaboratively with patients (and their families) to navigate their complex issues and jointly focusing on simple solutions to work towards improving their mental health.

Dr. Fang is a board-certified psychiatrist who completed his psychiatry residency at Duke University, where he received extensive training in Psychopharmacology, Psychotherapy (“Talk Therapy”), Transcranial Magnetic Stimulation (TMS), and Electroconvulsive Therapy (ECT). Throughout his life, Dr. Fang has lived in various places such as China, Canada, Upstate New York, Maine, and North Carolina, where he currently resides. This rich cultural experience allows him to connect with individuals from diverse backgrounds, which is crucial in the field of psychiatry where treatment is so highly personal. Dr. Fang has also practiced in multiple settings including a college mental health clinic, an adult ADHD clinic, a perinatal psychiatry clinic, a VA hospital, and a residential recovery program.

While Dr. Fang’s current practice is primarily focused on medication treatment, he utilizes his training as a therapist to ensure that patients feel understood and empowered to discuss any other issues they might be facing. With experience in many modalities of therapy including Psychodynamic, Supportive, Cognitive Behavioral Therapy (CBT), and Acceptance and Commitment Therapy (ACT), Dr. Fang knows that one size does NOT always fit all. If more in-depth therapy is felt to be beneficial, Dr. Fang may refer clients to a separate therapist.