John Bardugon, MD

Dr. Sean Culver is an outpatient psychiatrist with experience treating a wide variety of disorders across multiple distinct age groups. He completed his undergraduate education at the University of Pittsburgh, graduating summa cum laude while majoring in neuroscience. He attended medical school at the Ohio State University College of Medicine, where he was granted an annual merit scholarship. Dr. Culver then remained at the OSU Wexner Medical Center for residency training. Outside of psychiatry, he enjoys numerous interests including soccer, hockey, music, photography, and video games.

During residency, Dr. Culver developed particular interest in working with young adults, college students, and athletes, but is comfortable with patients of all ages. He strongly believes in the practice of evidence-based medicine, utilizing the most current research to guide recommendations. He is a strong advocate for patient autonomy and therefore provides psychoeducation on diagnoses and medications so that each patient can make informed decisions which align with their own values.

Dr. Culver approaches each patient in the context of their individual interests, family dynamics, and life goals. He understands that not every patient requires or desires medication and is comfortable in a number of psychotherapy techniques including cognitive behavioral therapy, psychodynamic therapy, and supportive therapy. He emphasizes a trusting and honest therapeutic relationship with his patients.

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Dr. Mandel received his Bachelor of Arts and Doctor of Medicine degrees from the University of Pennsylvania. He completed his Residency in Psychiatry at Mount Sinai Medical Center in Manhattan. He has been board certified in psychiatry since 2001 and is a Life Fellow of the American Psychiatric Association. He has held numerous clinical and academic appointments including serving as Chairperson of Psychiatry at Huntington Hospital in Huntington, New York, and Assistant Professor of Psychiatry at Hofstra North Shore-LIJ School of Medicine.

Dr. Mandel has over 25 years of clinical experience treating all mental health conditions. He has a strong interest in mood and anxiety disorders, including work-related anxiety. He authored a section on the pharmacology of social anxiety in the book Work Makes Me Nervous. Dr. Mandel also has expertise working with clients diagnosed with borderline personality disorder. He has lectured on the pharmacologic management of this condition, including a presentation at the NIMH International Think Tank for the More Effective Treatment of Borderline Personality Disorder.

Dr. Mandel continually seeks to streamline complex medication regimens. He has completed a fellowship in integrative psychiatry and carefully considers the potential contributions of lifestyle and nutrition to overall mental health and well-being. By taking an eclectic approach, Dr. Mandel is able to achieve the best possible outcome for all whom he is privileged to serve.

Background and credentials

Dr. Robert Whelpley, M.D., is board-certified in both Child and Adolescent Psychiatry and Adult Psychiatry. He completed his undergraduate studies at Binghamton University and earned his medical degree from Upstate Medical University in Syracuse, New York. He then went on to complete his residency and fellowship training at the University of Rochester. Throughout his career, he has worked with patients and families across the lifespan in inpatient, outpatient, and emergency psychiatric settings.

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Treatment approach

Dr. Whelpley believes in collaborative care, working closely with treatment providers, patients, and families to ensure that mental health concerns are addressed as a team. His approach integrates talk therapy techniques, including motivational interviewing, cognitive-behavioral therapy (CBT), mindfulness, and supportive psychotherapy, alongside medication management. He customizes treatment to maximize each patient’s mental health and overall wellness, sometimes incorporating a therapist into the care plan when beneficial.

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What you can expect in a first visit

During the first visit, patients can expect a comprehensive evaluation where Dr. Whelpley takes time to understand their symptoms, background, and treatment goals. His approach is patient-centered and team-oriented, ensuring that care is personalized and collaborative. He works with patients to develop a treatment plan that balances medication management with therapeutic interventions, fostering long-term mental wellness.

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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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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. Leslie Chavez is a board-certified adult psychiatrist with a diverse background in clinical and academic medicine. She completed her medical school and residency at the University of New Mexico, where she later served as a psychiatrist and assistant professor, treating high-need patients and teaching residents and medical students. During the pandemic, she transitioned to telehealth and has been dedicated to this field for the past four years. Dr. Chavez is known for making her patients feel seen and heard, using both medication management and supportive psychotherapy. Dr. Chavez began her academic journey as a physics major at UNM and then studied biophysics at the University of San Diego, California. During her postdoctoral fellowship at Los Alamos National Laboratories, she was inspired by presentations about professionals working with patients in African countries, which sparked her interest in medicine. During this time, her father died of cancer, and she saw the impact of mental health therapy on his quality of life, further solidifying her motivation to attend medical school. Witnessing the profound impact of mental health on her patients and family, she specialized in psychiatry. Dr. Chavez is a seasoned psychopharmacologist and emphasizes the importance of nutrition, exercise, and community in mental health. She enjoys all aspects of medicine and combines her extensive knowledge with a patient-centered approach.

Rebecca Kostopoulos, PMHNP, is a board-certified psychiatric nurse practitioner committed to helping individuals facing mental health challenges lead full and balanced lives.

Her practice primarily focuses on medication management, often combined with supportive or emotionally focused therapy during 30-minute follow-up visits. When appropriate, Rebecca may recommend involving an additional therapist to ensure the most effective and comprehensive care.

She earned her Master of Science in Nursing with a specialization in psychiatry from Columbia University and her Bachelor of Science in Nursing from Boston College. Her training includes psychiatric diagnosis, medication management, and both psychodynamic and cognitive-behavioral therapies.

With over a decade of experience, Rebecca has evaluated and treated adults in a variety of clinical settings. Her previous roles include working at Elmhurst Hospital’s Comprehensive Psychiatric Emergency Program, Gracie Square Hospital’s inpatient unit, as well as in community health centers and skilled nursing facilities.

As a nurse practitioner, Rebecca believes that mental health is just as vital as physical health. She values the therapeutic relationship and approaches treatment with empathy and collaboration, ensuring that each patient receives personalized and compassionate care.

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