Alexander Van-Den-Ende, DO

Mu Xu, MD is a Psychiatrist at Talkiatry. He obtained his medical doctorate degree from the University of Chicago Pritzker School of Medicine and PhD from New York University. He completed his psychiatry residency at New York University. Dr Xu is licensed to practice in California, New York, New Jersey, Connecticut, Pennsylvania, and Maryland. Dr. Xu provides both medication management for a variety of psychiatric conditions. Dr. Xu is fluent in English and Mandarin. Dr. Xu is a general adult psychiatrist specializing in medication management. He values building strong connections with patients from all walks of life and tailoring treatments to their unique needs. His working style is characterized by attentive listening, detailed follow-up questions, and straightforward communication, fostering a collaborative and empathetic environment.

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.

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Dr. Vanessa Valdes is an adult psychiatrist specializing in medication management and psychotherapy, with a strong focus on nutrition, wellness, and mindfulness. She earned her combined MD/MPH degree from the University of Miami Miller School of Medicine and completed her psychiatry residency at the University of Miami/Jackson Health System, one of the nation's leading public healthcare systems.‍During her residency, Dr. Valdes gained broad experience in diverse areas of psychiatry, including inpatient psychiatry, emergency psychiatry, outpatient care, psychotherapy, hypnosis, child and adolescent psychiatry, consultation-liaison psychiatry, psycho-oncology, and addiction psychiatry.‍Dr. Valdes primarily provides supportive psychotherapy and acceptance and commitment therapy to help patients better understand and address their stressors. She takes a holistic approach to care, emphasizing the emotional, spiritual, and physical well-being of her patients. Her goal is to inspire meaningful, sustainable changes in patients' lives through compassionate, comprehensive treatment.

Dr. Mendez-Maldonado is double board-certified in general psychiatry and geriatric psychiatry. She received her medical degree from the University of Puerto Rico School of Medicine. She then moved to New York to complete her residency training at Mount Sinai Beth Israel where she stayed to complete her fellowship in geriatric psychiatry. After her fellowship, she proceeded to work at Woodhull Hospital where she worked as an attending before becoming unit chief and running their Special Pathogens Unit during the COVID-19 pandemic. She focuses on medication management and offers this in conjunction with supportive therapy, cognitive-behavioral techniques, a focus on nutritional psychiatry, and 30-minute follow-up visits. Dr. Mendez-Maldonado focuses on integrating nutrition, physical activity, and mindfulness techniques alongside pharmacotherapy to achieve a well-rounded approach to mental health.‍

Xavier Diao, MD (he/him) is a board-certified psychiatrist. He earned his undergraduate degrees in Psychology and Biological Sciences at the University of Maryland, where he also obtained his medical degree. Dr. Diao completed his psychiatry residency at the Icahn School of Medicine at Mount Sinai, received additional training in child and adolescent psychiatry at Columbia and Cornell, and finished a psychoanalytic fellowship at the New York Psychoanalytic Society & Institute. Prior to joining Talkiatry, he was an Assistant Professor of Clinical Psychiatry at the University of Pennsylvania, where he provided clinical care and teaching along the undergraduate-graduate medical education continuum.

Dr. Diao's therapeutic orientation is informed by psychodynamic, cognitive behavioral, and dialectical behavior modalities. He has expertise in the treatment of a diverse range of mental health conditions, including depression, anxiety, OCD, and PTSD. Dr. Diao uses a developmentally informed and LGBTQ-affirmative approach in his practice, with the aim of enriching meaning and alleviating suffering in the domains of work, play, and love.

Dr. Diao begins each encounter with gentle curiosity, inviting patients to share their stories without fear of judgment. Together, he crafts an individualized treatment plan with the patient that may include medication, psychotherapy, and/or referrals to subspecialty care, always in close collaboration with other members on the treatment team.

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Dr. Corey Greenwald is a board-certified psychiatrist with years of experience treating patients in both acute inpatient psychiatric emergencies and outpatient medication and psychotherapy settings. He earned his medical degree from Brown University, completed his internship in the Columbia system, and pursued residency training at Mount Sinai Medical Center in New York City. Dr. Greenwald has practiced in academic, urban, suburban, and rural environments, which has given him broad perspective and adaptability in caring for diverse patient populations.

Dr. Greenwald emphasizes psychoeducation as a core part of care, ensuring patients are active participants in understanding and managing their mental health. He brings a deep interest in transcultural issues and in how social media and news cycles impact emotional well-being. Having witnessed the effects of mental illness within his own family, Dr. Greenwald approaches his work with empathy, insight, and a strong commitment to helping patients feel supported throughout their journey.

Dr. Greenwald works collaboratively with patients to define or clarify concrete treatment goals by the end of the initial appointment. He maintains a low threshold for revisiting and adjusting treatment plans if progress feels unsatisfactory, ensuring care remains flexible and effective. His informal, eclectic interpersonal style allows him to tailor his approach to each individual, fostering trust and partnership in the therapeutic process.