Matthew Hamilton, MD

Dr. Kevin DiCesare is a board-certified psychiatrist, treating adults. He received his undergraduate degree at Harvard University, his medical degree at the University of Massachusetts Medical School, and then went on to train at Maine Medical Center for his psychiatric residency. He has 22 years of expertise in diagnosing and treating psychiatric conditions, including depression, anxiety, Bipolar spectrum disorders, adjustment problems, ADHD and other disorders. He is well versed in psychopharmacological interventions, but is a proponent of patients also being active in psychotherapy whenever appropriate. He prides himself in collaboratively arriving at treatment decisions with his patients, and taking the time to listen to their concerns and answer their questions.

Dr. DiCesare has worked in various settings, including community mental health centers and large hospital systems, with experience in inpatient, outpatient, and consultative roles. Prior to joining Talkiatry, he most recently served as an attending psychiatrist on the staff of Southern New Hampshire Health System, where he provided consultative care to referrals made from primary care providers and various specialists.

Dr. Jennifer Ruch is a board-certified psychiatrist who strives to understand her patients' lived experiences and aspirations to develop supportive therapeutic relationships through empathetic listening, mutual trust, and respect. She collaboratively creates individualized care plans that align with personal treatment goals in a safe and judgment-free environment. After completing her Bachelor of Science degree in Human Biology with a focus in psychology from the University of California, Merced, she earned her medical degree from Lake Erie College of Osteopathic Medicine. Dr. Ruch completed her General Psychiatry Residency at Arnot Ogden Medical Center in New York. Her clinical experience involves treating individuals of all age groups from diverse populations and socioeconomic backgrounds suffering from anxiety, depression, bipolar disorder, psychotic disorders, neurodevelopmental disorders, and neurocognitive disorders. She has provided care in inpatient and outpatient psychiatric facilities, the Veterans Affairs Medical Center, emergency rooms, state facilities, and an inpatient chemical dependency center. She also performed pre-procedure psychological evaluations for bariatric and spinal cord surgeries, and psychiatric consult liaison services on medical units and has clinical training in inpatient and outpatient neurology. Her clinical experience incorporated treatment modalities such as pharmacotherapy and interventional psychiatry, including Transcranial Magnetic Stimulation and Spravato. Dr. Ruch integrates a wide array of psychotherapy as needed; however, her practice primarily focuses on medication management while utilizing referrals to therapists and providing collaborative care for optimal outcomes.

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. Michele Kerbow is a board certified psychiatrist with more than 20 years of clinical experience. She completed her undergraduate training at Clemson University before continuing to the University of South Carolina School of Medicine in Columbia, SC. From there, she completed her General Psychiatry Internship and General Adult Psychiatry Residency through the University of Virginia in Roanoke. Though she has a wide array of experience in psychiatric care and psychological assessment, Dr. Kerbow has a particular interest in the treatment of Veterans' issues and trauma. Her most recent work saw her caring for both Veterans and Active Duty military through the Fayetteville VA Medical Center in Jacksonville, NC and the Naval Hospital Jacksonville in Florida. She believes strongly in the interconnectivity of mental and physical health, especially as it relates to trauma. Patients seeking psychiatric assistance will find Dr. Kerbow to be an empathetic and approachable provider. She places an emphasis on the importance of both therapy and medication management in the treatment of mental health, and has a strong history of collaboration with therapists and counselors in order to enact the best treatment plan possible.

Margaret Ngumi, MSN, APRN, FNP-C, PMHNP-BC, is a dual board-certified Psychiatric Mental Health and Family Nurse Practitioner with over 20 years of experience in healthcare. She began her career as a Family Nurse Practitioner and later pursued a post-master’s certification in psychiatry to address the growing need for accessible mental health services. Margaret has extensive experience in both inpatient and outpatient settings, treating conditions such as depression, anxiety, PTSD, mood disorders, and substance use disorders.

She takes a collaborative, patient-centered approach to care, creating a safe and supportive environment where individuals feel heard and empowered. With a strong emphasis on holistic care, Margaret considers all aspects of a patient’s well-being—including lifestyle, relationships, and overall health. Whether through medication management, therapy, or lifestyle modifications, she is committed to helping patients achieve meaningful and lasting improvements in their mental health.

Margaret begins with a comprehensive psychiatric evaluation to understand each patient’s history, concerns, and goals. She then works closely with them to develop a personalized care plan that may include medication, therapy, and evidence-based lifestyle interventions. She prioritizes open communication, patient education, and ongoing collaboration to ensure treatment remains effective and evolves with each patient’s needs. Through her compassionate and evidence-based approach, Margaret is dedicated to helping individuals find balance and improve their overall quality of life.

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Dr. Caitlin Gardiner is a board-certified psychiatrist specializing in child and adolescent psychiatry and psychotherapy. Dr. Caitlin Gardiner's practice is based on the biopsychosocial model and believes that the foundation of healing is in psychotherapy and human connection. She is known for incorporating therapy into her medication management practice. Typically she offers 30-minute follow-up visits for medication management with focused therapy based on individual needs. As a known helper, Dr. Gardiner started her career with a bachelor's degree in social work from Cazenovia College in Cazenovia, NY. After changing career paths, she received her medical degree from SUNY Upstate Medical University in Syracuse, NY. She stayed upstate to complete her general psychiatry residency, where she was chief resident at the beginning of the COVID-19 pandemic. Following this, she completed her child and adolescent psychiatry fellowship at Upstate due to the high quality of training. Dr. Gardiner has completed 3 years of advanced training in Dynamic Deconstructive Psychotherapy as well as specialized training in DBT. Dr. Gardiner is a well-rounded psychiatrist who enjoys treating youth and young adults during transitional phases of life while providing a safe and supportive environment. She believes strongly in reducing polypharmacy and providing high-quality medication management through a therapeutic and developmental lens.