Dr. Brett R. Nelson is a distinguished psychiatrist and the owner of the New York Center for Psychiatry (NYCP). He also serves as the Chief Medical Officer at Four Winds Hospital in Saratoga Springs. His professional journey spans nearly two decades, and he is an alumnus of the University of South Dakota Sanford School of Medicine, holding a Bachelor's degree in Biology and Psychology from Augustana University.

Dr. Nelson completed all coursework for a Master's degree in Public Health at the University of Minnesota, providing him with a broad understanding of health care beyond his medical practice. His comprehensive training includes residencies in General Psychiatry at the University of Florida School of Medicine and Child and Adolescent Psychiatry at the University of South Florida School of Medicine. This has led to his double board certification in both Adult and Child & Adolescent Psychiatry by the American Board of Psychiatry and Neurology (ABPN).

In addition to his role at Four Winds Hospital, Dr. Nelson oversees patient care at NYCP. His dedication to providing high-quality care has earned him much respect and recognition within the medical community.

Dr. Nelson continues to make a significant impact on the field of psychiatry, particularly through his work in improving psychiatric services and care. He has a particular interest in obsessive-compulsive disorder in children, a topic on which he has published multiple research studies.

Dr. Nelson's commitment to advancing his field is further demonstrated by his active membership in professional organizations like the American Academy of Child and Adolescent Psychiatry and the American Psychiatric Association. His extensive expertise and patient-centered approach continue to positively influence the field of psychiatry.

Dr. Sumida is a distinguished psychiatrist with more than two decades of experience in medical psychiatry. She is a double Board-Certified Psychiatrist, recognized by the American Board of Psychiatry and Neurology (ABPN). She holds a medical degree from the University of Cincinnati College of Medicine, a Master of Science from the University of Cincinnati McMicken College of Arts and Science, and a Bachelor of Arts from Smith College.

Dr. Sumida’s extensive training includes a residency in Psychiatry at the University Hospital Department of Psychiatry and a Child Psychiatry Fellowship at the Children’s Hospital Medical Center. This rigorous training, coupled with her years of experience, has equipped her with the skills and knowledge to help her patients overcome significant mental health challenges.

Prior to joining NYCP, Dr. Sumida served her clients at Four Winds Saratoga on an outpatient basis, providing comprehensive and personalized care. She also held the position of Assistant Professor in the University of Cincinnati College of Medicine's psychiatry department, showcasing her commitment to teaching and mentoring the next generation of psychiatrists.

Dr. Sumida is an active member of the American Association of Child and Adolescent Psychiatry, reflecting her dedication to her field and her commitment to staying updated with the latest developments in child and adolescent psychiatry.

Away from her professional life, Dr. Sumida is an avid equestrian and enjoys spending quality time with her horses. Her love for animals extends beyond her professional life, providing a sense of balance and relaxation.

Shelly Hagen is a board-certified Psychiatric Mental Health Nurse Practitioner (PMHNP-BC) who specializes in the treatment of ADHD, anxiety, and mood disorders. As a Registered Nurse (RN) with a Master of Science in Nursing (MSN), and a graduate of Russell Sage College, she brings both strong clinical expertise and a deeply compassionate, human-centered approach to her work.

Shelly is dedicated to supporting individuals and families through life’s emotional and mental health challenges. She offers personalized, evidence-based care that meets each person where they are, with the belief that effective treatment is rooted in trust, collaboration, and genuine connection. Her goal is to create a space where clients feel truly seen, heard, and supported.

In her private practice, Shelly provides thoughtful medication management while helping clients build resilience, gain clarity, and move toward meaningful, lasting change. Her warm, approachable style fosters strong therapeutic relationships that support growth, confidence, and overall well-being.

Before becoming a nurse, Shelly worked in pharmaceutical advertising and is also a published author and ghostwriter. Her experience interviewing patients and physicians sparked a passion for deeper, more direct involvement in patient care—ultimately leading her to pursue a career in healthcare.

In addition to her private practice, Shelly works part-time at Four Winds Saratoga and is a member of the New York State Nurse Practitioner Association.

Carrie started out as pediatric RN (registered nurse) at Four Winds Saratoga almost 15 years ago, where her passion and advocacy for mental health grew progressively year by year. She wanted to be able to do more for her patients and their families, so obtained her Master of Science in Nursing (MSN) through Russell Sage College and became a board certified, licensed Psychiatric Mental Health Nurse Practitioner (PMHNP).

Through your first couple visits and beyond, Carrie wants to get to know you, not just your symptoms. Carrie believes mental healthcare should start with connection, and feel personal and supportive, that clients should leave their appointments feeling understood, and more importantly, heard. Her goal is to create a warm and welcoming, safe space where you can show up exactly as you are, and feel comfortable, supported, and empowered, along your mental health journey. 

Carrie provides compassionate, comprehensive mental health services to adolescents using evidence-based practices to assess and address a variety of conditions such as depression, anxiety, mood disorders, and ADHD. She enjoys working with clients (and their families) through symptom and medication management, to reach attainable treatment goals. Carrie believes in creating individualized plans of care that prioritize client involvement and interprofessional collaboration. She works alongside many skilled and experienced clinicians that she is happy to collaborate and coordinate care with, when appropriate to meet her clients’ needs, developing a treatment plan with continued success that carries outside of our practices' walls. 

Carrie is a member of the New York State Nurse Practitioner Association, and the Sigma Theta Tau International Honor Society of Nursing. When not at work, Carrie enjoys being outside, hiking, or on the lake with her family fivesome and 2 dogs. She is also known to blare some 80s & 90s classics while working on the wheel as a hobby potter in their garage ceramic and stained glass studio. 

Alexis is a board-certified Psychiatric Nurse Practitioner, with a special interest in working with children and adolescents. She has experience treating a range of mental health concerns, including anxiety disorders, depression, ADHD, behavioral challenges, mood disorders, and trauma-related conditions.

She earned her Master of Science in Nursing from Russell Sage College. Prior to becoming a nurse practitioner, she worked as an inpatient psychiatric nurse specializing in acute care, in addition to experience in medical-surgical nursing. She also works as a psychiatric nurse practitioner at Four Winds Hospital.

Before entering nursing, Alexis earned a degree in Community Health and worked as a community nutrition educator with Cornell University Cooperative Extension, providing education and support to children in underserved communities, reflecting a longstanding commitment to prevention and health education. Her diverse professional background allows her to approach care from a holistic perspective, recognizing the important connection between physical and mental health.

Alexis strives to create a supportive and compassionate environment where patients feel heard, understood, and empowered throughout their treatment journey.

Outside of work, Alexis enjoys spending time with family and friends, traveling, and taking her Bernese Mountain Dog on adventures.