Marianne Marsh, MD

Courtney Baker, DO, is a Board-Certified Adult, Child & Adolescent Psychiatrist with 14 years of experience treating conditions such as ADHD, major depression, and generalized anxiety disorder. She specializes in ADHD care, emphasizing a holistic, comprehensive approach. Dr. Baker earned her Doctor of Osteopathy from Des Moines University College of Osteopathic Medicine and completed her internship, psychiatry residency, and Child & Adolescent Psychiatry Fellowship at UMDNJ-SOM and Penn State Milton S. Hershey Medical Center. She currently serves as an Assistant Professor of Psychiatry at Lake Erie College of Osteopathic Medicine (LECOM) at Seton Hill.

Dr. Baker prioritizes treating the whole patient, blending medication management with cognitive-behavioral therapy techniques. She fosters a warm, supportive, and non-judgmental environment where patients—especially children and adolescents—feel safe and heard. Committed to accessible care, she maintains open communication and collaborates closely with patients to achieve sustainable mental health solutions.

Dr. Baker begins with a comprehensive diagnostic interview to understand each patient’s history, concerns, and goals. She develops individualized treatment plans that may combine medications and therapy techniques tailored to lifestyle and needs. Follow-up appointments focus on monitoring progress, adjusting treatments, and setting clear, achievable goals to improve overall well-being and functioning.

*THIS PROVIDER CANNOT PRESCRIBE CONTROLLED SUBSTANCES FOR NH PATIENTS* Dr. Peter Truong is a board-certified psychiatrist trained in Adult Psychiatry. He received his medical degree from FIU Herbert Wertheim College of Medicine in Miami, Florida, and completed his residency training at Cambridge Health Alliance – Harvard Medical School.

Dr. Truong treats each patient with a holistic, evidence-based approach that incorporates psychopharmacological and psychotherapeutic best practices. His priority is to build a safe and trusting working relationship with each patient, keeping in mind their unique biological, psychological, social, and spiritual contexts.

Dr. Truong has extensive experience treating depression, anxiety, ADHD, and trauma-related disorders. He incorporates therapy modalities such as supportive, psychodynamic, CBT, and EFT. Other professional interests include LGBTQIA and college mental health, mindfulness, and interventional psychiatry. He has worked with individuals with diverse backgrounds from all walks of life.

Background and credentials

Dr. Gerald Matthews is a board-certified adult psychiatrist. He earned his medical degree from the University of Louisville School of Medicine in Louisville, KY. Following medical school, he entered active duty service in the U.S. Army, where he completed his psychiatry residency at Tripler Army Medical Center in Honolulu, HI. After completing his training, he practiced as a staff psychiatrist at Fort Hood, TX, fulfilling his service obligation.

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Treatment approach

Dr. Matthews specializes in medication management, working primarily with adult patients in an outpatient setting. While his primary focus is pharmacological treatment, he frequently collaborates with therapists to provide comprehensive care when indicated. He has extensive experience treating civilians, active-duty military personnel, and veterans, addressing conditions such as mood and anxiety disorders, psychosis, and trauma-related disorders.

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What you can expect in a first visit

During the first visit, patients can expect a thorough psychiatric evaluation where Dr. Matthews takes time to understand their history, symptoms, and treatment goals. He provides a structured yet compassionate approach to care, discussing medication options and potential therapeutic interventions. For patients who may benefit from additional therapy, he collaborates with therapists to ensure a well-rounded treatment plan tailored to each individual's needs.

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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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***Provider does not prescribe controlled substances*** Dr. David Eiler is a staff psychiatrist at Talkiatry. He is board certified in adult psychiatry. Before joining Talkiatry, Dr. Eiler was a staff psychiatrist at Dartmouth-Hitchcock Medical Center (DHMC), where he had an academic appointment and served as clinical director of transcranial magnetic stimulation (TMS) and intranasal esketamine services. In his practice, Dr. Eiler has focused on medication management and interventional techniques, including TMS, for the treatment of depression and other disorders. Dr. Eiler received his MD from the University of Wisconsin School of Medicine and Public Health and completed his residency at DHMC.

Dr. Georgia Gaveras holds the position of Co-Founder and Chief Medical Officer at Talkiatry. She is triple board-certified in child and adolescent psychiatry, adult psychiatry, and addiction medicine. She has been practicing for over 18 years. Dr. Gaveras's practice focuses on medication management. Typically, she offers this in conjunction with supportive or emotionally focused therapy in 30-minute follow-up visits. However, occasionally Dr. Gaveras may believe that additional therapy is also needed and ask that you bring a therapist into your care team to provide the best outcome. She received her medical degree from the University of New England College of Osteopathic Medicine in Biddeford, ME, before moving back to NY to complete her residency at the SUNY Downstate Medical Center and a fellowship in child and adolescent psychiatry at St. Luke's-Roosevelt Hospital. After completing training, she remained and worked with dually-diagnosed adolescents at the Comprehensive Rehabilitation and Education Service (CARES) before becoming the Director of Training and Education for the Mount Sinai St. Luke's and Roosevelt Hospitals. She was then the associate director of child and adolescent emergency psychiatry at Cohen Children's Medical Center before becoming the Director of the Comprehensive Psychiatric Emergency Program (CPEP) at Kings County Hospital in Brooklyn. Dr. Gaveras has held academic appointments at Columbia University College of Physicians and Surgeons, Mount Sinai Icahn School of Medicine, Touro College of Osteopathic Medicine, Zucker School of Medicine, and SUNY Downstate Medical College. In addition, she has appeared in numerous professional publications and authored several research papers. In addition to general, child, and adolescent psychiatry, Dr. Gaveras is also board-certified in addiction medicine and trained in the Eating Disorders, Compulsions and Addictions Service (EDCAS) program at the William Alanson White Institute. She completed her undergraduate studies at New York University. While having treated a wide variety of patients, her primary clinical focus has been in treating adolescents and young adults with co-occurring substance use disorders.

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.

*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.