Michelle Hamilton, PMHNP

Margaret Gorelick is a board-certified Psychiatric-Mental Health Nurse Practitioner (PMHNP-BC) through the ANCC. She earned her Master of Science in Nursing from Fairfield University and her Bachelor of Science in Nursing from Western Connecticut State University. With 10 years of psychiatric experience, she began her career at MedStar Georgetown University Hospital in neurology and neurosurgery, later transitioning to psychiatry at Yale New Haven Hospital and Stamford Hospital. She provides outpatient medication management and psychotherapy, including psychodynamic therapy and CBT, for adults 18+, and has led grief support groups.

Margaret practices with a nonjudgmental, respectful approach grounded in active listening and trust. She believes healing begins with understanding and is dedicated to supporting individuals through every stage of their mental health journey.

The first visit is a comprehensive psychiatric evaluation to review history, symptoms, and goals, forming a personalized plan. Follow-ups are 30 minutes and focus on monitoring medication response, adjusting treatment as needed, and providing ongoing therapeutic support to ensure safe, effective progress.

Ms. Walkiewicz is a licensed professional counselor and is certified by the NBCC. She also has Certifications in Telehealth EMDR, and as a Certified Clinical Telemental Health Provider. Her position at Talkiatry is that of a psychotherapist who works along with a licensed psychiatrist in the states of Pennsylvania and New York. In her career of over 25 years, her areas of focus are: child/adolescents/adults. Pamela offers modalities in CBT, DBT, Trauma Focused CBT, EMDR, Motivational Interviewing, Problem Solving Therapy, Psychoanalytical Therapies, and Adult ADHD. Also trained in modalities for specialty groups such as LGBTQ+. Family/couples Therapy, and Personality Disorders. Also has experience with DID, and Depersonalization. Pamela received her Undergraduate and Master's degree from Gannon University in Erie, Pa. Her majors are Political Science, and Psychology, Master's in Community Counseling. She began her career as a therapist at Sarah Reed Children's Center. She did individual therapy, family, crisis, and assessments. From there, she moved to Alabama to do administrative work and private practice. Now back in Pa. Her work in Pennsylvania and New York focuses on Outpatient Therapy as a Licensed Professional Counselor. Her most recent Certifications are within the work with Telemedicine for mental health conditions. Her work in Pennsylvania and New York focuses on Outpatient Therapy as a Licensed Professional Counselor. Her most recent Certifications are within the work with Telemedicine for mental health conditions.

Dr. De Jesus is a bilingual psychiatrist, fluent in English and Spanish. She is a double board-certified psychiatrist in Adult Psychiatry and Child & Adolescent Psychiatry. Dr. De Jesus provides medication management services in combination with supportive therapy during 30-minute follow-up visits. Dr. De Jesus received her medical degree from the Universidad Central del Caribe School of Medicine in Bayamon, Puerto Rico. She completed her Adult Psychiatry residency at Jackson Memorial Hospital in Miami, FL. Subsequently, Dr. De Jesus pursued her fellowship in Child and Adolescent Psychiatry at Thomas Jefferson University Hospital in Pennsylvania and was a Chief Resident during her last year of training. Dr. De Jesus has been providing psychiatric services in the community mental health setting for 8 years. Her clinical focus has been in treating children, adolescents, and young adults with depression, anxiety, posttraumatic stress disorder, and ADHD. Dr. De Jesus believes in the importance of establishing an individualized treatment approach to meet each individual's need while providing comprehensive care to her patients.

James "Derek" Slover, LPC-S (but just call him Derek), has been practicing counseling since 2006. He has worked in a wide range of settings, including community clinics, hospitals, and telehealth- and now helps teens, parents, and adults navigate the challenges of anxiety, mood disorders, behavior issues, and more.

Derek's approach is collaborative, practical, and rooted in evidence-based care. He brings humor, clarity, and a no-nonsense style to counseling, believing that treatment should make sense and feel useful. You won't get psychobabble or a 47-slide PowerPoint presentation- just honest conversations, thoughtful listening, and tools that work. His clinical toolbox includes CBT, Parent Management Training, Exposure & Response Prevention, and other proven approaches tailored to each person's needs.

Counseling with Derek starts with a thorough assessment to understand what’s been getting in your way. From there, you’ll work together to set goals that reflect your values and priorities. Counseling typically moves through three phases: 1) building a strong therapeutic relationship, 2) doing the deep work of change, and 3) maintaining progress and preparing for graduation- because counseling should be a launchpad, not a lifelong subscription.

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Severine Dondina, PMHNP-BC, is a board-certified psychiatric nurse practitioner with licensure in Washington and Florida. She holds a Master of Science in Nursing from the University of Alabama at Birmingham and graduated summa cum laude with dual bachelor’s degrees in nursing and biomedical science. Her background spans outpatient, community, forensic, and crisis psychiatry, including leadership roles with Florida’s Assertive Community Treatment (FACT) and Multi-Disciplinary Forensic Teams.

Currently serving patients in Washington, Severine treats adults with ADHD, anxiety, depression, PTSD, and bipolar disorder. She brings a trauma-informed, strengths-based approach to care and is deeply committed to creating affirming spaces for LGBTQ+ and gender-diverse individuals. Her clinical style combines evidence-based medication management with warm, collaborative support.

Trilingual in English, French, and Spanish, Severine is known for her cultural sensitivity, clinical rigor, and authentic presence. She approaches each patient with curiosity, humility, and respect—believing healing begins with connection.

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Background and credentials

Dr. Nereida Gonzalez-Berrios is a general psychiatrist fluent in English and Spanish. She earned her bachelor’s degree in Microbiology from the University of Puerto Rico and her medical doctorate from Ponce School of Medicine (now Ponce Health Sciences University). She completed her General Psychiatry Training Program at the University of Puerto Rico Medical Sciences Campus, graduating in 2008. After practicing privately in Puerto Rico, she relocated to Texas, where she worked for over five years at the Michael E. DeBakey VA Health System, providing mental health care to veterans. She has also gained extensive experience in telemedicine, working both within the VA system and as a locum tenens provider.

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Treatment approach

Dr. Gonzalez-Berrios has extensive experience treating a wide range of psychiatric conditions, including mood disorders, anxiety disorders, psychotic disorders, intellectual impairment, ADHD, eating disorders, PTSD, and personality disorders. She integrates traditional psychiatric treatment with a holistic wellness approach, drawing on her background as a motivational speaker, wellness coach, certified personal fitness trainer, nutrition coach, and weight-loss specialist. Her approach emphasizes improving overall mental and physical well-being through personalized treatment plans that incorporate psychiatric care, wellness strategies, and lifestyle modifications.

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What you can expect in a first visit

Patients can expect a comprehensive psychiatric evaluation where Dr. Gonzalez-Berrios carefully assesses their symptoms, medical history, and personal wellness goals. She takes a collaborative and patient-centered approach, ensuring that treatment is tailored to each individual’s mental and physical health needs. As an experienced telemedicine provider, she offers accessible and flexible mental health care, combining medication management and holistic wellness strategies to help patients achieve lasting well-being.

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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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