Stephen Geisler, MD

Background and credentials

Dr. Escamilla is a board-certified psychiatrist with over 20 years of experience in treating mental health conditions. He is a graduate of Harvard College and earned his medical degree from the University of Texas Southwestern Medical School. He completed his psychiatry training at the University of California at San Francisco and further specialized through a research fellowship with the American Psychiatric Association. In addition to his clinical work, he is a Jungian Analyst and holds academic positions as an adjunct professor at Rutgers University Department of Psychiatry and as the Frank McMillan Jr. Scholar at the Jung Center of Houston.

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Treatment approach

Dr. Escamilla brings a deeply analytical and research-driven approach to psychiatry, integrating traditional psychiatric treatment with Jungian analysis. He has a strong background in academic research and clinical psychiatry, contributing extensively to the field through research publications. His expertise spans a wide range of mental health challenges, and he is committed to understanding the complexities of each patient’s experience to tailor a treatment plan that best suits their needs.

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What you can expect in a first visit

During the first visit, patients can expect a comprehensive psychiatric evaluation that takes into account their personal history, psychological patterns, and treatment goals. Dr. Escamilla’s approach emphasizes thoughtful analysis and evidence-based care, ensuring that each patient receives a personalized and insightful treatment plan. His sessions may incorporate medication management, psychotherapy, and Jungian analytical techniques to provide a holistic and individualized treatment experience.

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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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*THIS PROVIDER CANNOT PRESCRIBE CONTROLLED SUBSTANCES FOR NH PATIENTS* Doctor Phillip Sullivan is a staff psychiatrist at Talkiatry. He is board certified in both adult psychiatry and child and adolescent psychiatry. His interest in psychiatric treatment was originally triggered by the humanistic writings of Abraham Maslow, Carl Rogers, and Rollo May. As he earned his medical degree and started post-graduate psychiatric training, he went on to learn psycho-pharmacological, cognitive-behavioral, and psychodynamic treatment approaches. He combines these perspectives in diagnosing and treating psychiatric conditions including depression, bipolar spectrum disorders, anxiety, stress and trauma related disorders, adjustment problems, maternal mental health, OCD, ADHD and other disorders. His practice focuses on supportive pharmacological treatment, and he sees listening and empathy as essential elements of the treatment process. He strives to provide a comfortable experience in which doctor and patient work together to understand the presenting problems, develop a treatment plan, reduce symptoms, and optimize functioning. Doctor Sullivan supports and encourages concurrent psychotherapy and will work collaboratively with therapists to optimize the best treatment results. Doctor Sullivan received his MD degree from Brown University Alpert School of Medicine. After completing a medical-surgical internship, he went on to a residency in adult psychiatry and a fellowship in child and adolescent psychiatry at Harvard Medical School's Massachusetts Mental Health Center. He has held academic appointments at Harvard Medical School and the University of New England School of Osteopathic Medicine. In the 36 years following completion of his training, he has worked as the medical director of a mental health center on the under-served Eastern Shore of Maryland, as the medical director of a child and adolescent psychiatric inpatient unit, as a staff psychiatrist at New Hampshire's Dartmouth Hitchcock Clinic, and as the medical director of child and adolescent psychiatric services at Concord New Hampshire's mental health center. Before joining Talkiatry, he served for 18 years as the chief of psychiatry at Southern New Hampshire Medical Center where he also spent three years as the hospital's chief of staff.

Vincent is a licensed professional counselor who has earned his full licensure from the State of Texas. Vincent earned his bachelor's degree in Criminal Justice with a Minor in History from the University of Texas at San Antonio. He earned his Master of Arts in Counseling and Guidance from Texas A&M San Antonio. Vincent's counseling approach is eclectic, utilizing various modalities including, but not limited to Gestalt, Reality, Narrative, and Solution focused therapy. He is devoted to empowering individuals to free themselves from the excessive burdens of life by a remorseless society. He encourages you to become genuinely free and absolutely understand that you are the master of your own destiny. Vincent's treatment specialties and experience include working with adults, seniors, and adolescents from diverse populations and cultures. Whose suffering included, but not limited to anger, depression, career dilemmas, anxiety, stress, marital problems, collegiate status, self-esteem, family issues, as well as other unforeseen predicaments life unveils. Vincent uses these modalities in a holistic approach assessing clients within their culture, environment, community, and family system to gain a better insight into your distinctive reality. This holistic approach allows us to work together and tailor therapy to your needs. Allowing our collaboration to address the root causes of your current state of wellbeing. Our sessions, along with my education, background, and extensive life experience, have given me a reinforced foundation to assist you in facing the harsh realities of the world. Vincent will inspire you to live your life to its fullest without regret and create healthy tools of positive armor that will guide you eternally. Vincent's platform of therapy will fortify your weaknesses, enhance your strengths, and alleviate your fears where your voice is amplified and capable of surviving the vile discernment of others.

Dr. He is board-certified in adult psychiatry and addiction medicine. She is passionate about providing quality and accessible mental health care while considering each patient's concerns, values, and life circumstances. She received her medical doctorate degree from State University of New York (SUNY) Downstate Medical Center, and completed her psychiatry residency at George Washington University Hospital in DC. Prior to medical school, she completed a Master of Public Health from Yale School of Public Health. Dr. He has special clinical interests in providing trauma-informed and culturally competent care in the treatment of mental health conditions. She has experience working with special populations, such as minorities, immigrants, perinatal women, and LGBTQ+ communities. She holds a certificate from Harvard in Global Mental Health: Trauma and Recovery Program. She currently serves on the Board of Directors for a non-profit organization in Washington DC to prepare people recovering from mental illness to improve their quality of life. Although Dr. He's practice primarily focuses on medication management, she looks forward to getting to know you and incorporating her experiences with insight-oriented therapy in 20 or 30 minute follow-up visits.

Dr. Joshua Riederman is a board-certified psychiatrist with a specialization in the treatment of adults aged 18 to 65. Dr. Riederman obtained his undergraduate degree in brain, cognition, and neuroscience from the University of Michigan in Ann Arbor. He subsequently attended medical school at Nova Southeastern University in Fort Lauderdale, Florida, and completed his residency training at JFK Hospital in Palm Beach, Florida.

Dr. Riederman places a strong emphasis on establishing meaningful relationships with his patients and supporting them in achieving their individual life goals through effective treatment. He actively incorporates patient preferences into all treatment plans and integrates psychotherapy with medication management. Dr. Riederman recognizes the importance of educating patients about their care and dedicates time during each appointment to address any questions or concerns they may have.

In his clinical practice, Dr. Riederman begins by facilitating an open dialogue with patients regarding their primary concerns for the appointment. During initial consultations, he conducts a comprehensive assessment, which includes gathering relevant medical, familial, and social histories that may influence the course of treatment. In subsequent appointments, Dr. Riederman engages patients by inquiring about developments that have occurred since their last visit, as well as any issues related to medications or significant life events.

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Dr. John Weller, MD, is a psychiatrist with a strong foundation in science and clinical care. He earned his undergraduate degree in molecular genetics from the University of Vermont and conducted neuroscience research in both academic and industry settings. A graduate of St. George’s University School of Medicine, he completed his psychiatry residency at Mather Hospital, Northwell Health, where he was honored as Resident of the Year in 2025 and inducted into the Alpha Omega Alpha Honor Medical Society.

Dr. Weller is committed to providing compassionate, evidence-based care that considers the full spectrum of biological, psychological, and social factors. He builds therapeutic relationships on empathy, respect, and trust. By tailoring treatment plans to each patient’s personal and cultural context, he helps individuals take control of their mental health and work toward long-term recovery and resilience.

In the first session, Dr. Weller takes time to listen carefully and gather a thorough understanding of each patient's concerns, history, and current functioning. He uses empathy and active listening to foster open communication and develop personalized treatment plans that may include therapy, medication, or lifestyle changes, with the goal of restoring wellness and stability.