Find a psychiatrist in Port Jefferson Station, NY — covered by insurance

Hello! My name is Cathy Randolph and I am a Board-Certified Mental Health Nurse Practitioner. I developed my passion for mental health during my journey working with veterans in residential PTSD and Substance abuse programs. My specialties include, but are not limited to treating and managing PTSD, Substance abuse, ADD/ADHD, anxiety, depression, mood disorders, and adjustment disorder. I am also a Medicinal Marijuana clinician.

Hi, I'm Jean-Jeffrey Marcellus, DNP, PMHNP-BC, AGNP-BC, a board-certified Psychiatric Mental Health Nurse Practitioner with over 19 years of healthcare experience. I provide compassionate, evidence-based care for adults experiencing ADHD, anxiety, depression, insomnia, and substance use disorders.

I specialize in Medication-Assisted Treatment (MAT) for alcohol, opioid, benzodiazepine, kratom, and prescription medication dependence. My approach is collaborative and personalized, focusing on creating treatment plans that support each individual's goals, recovery, and overall well-being.

I offer both in-person and telehealth appointments, providing a welcoming, judgment-free environment where patients feel heard, respected, and empowered. I am committed to delivering culturally responsive care and making high-quality mental health services accessible to individuals from diverse backgrounds.

I am dual board-certified as a Psychiatric Mental Health Nurse Practitioner and Family Nurse Practitioner. After several years of clinical practice, I earned my doctoral degree in 2021. My experience spans both behavioral and family health settings, including hospital-based behavioral health units, partial hospitalization programs, and intensive outpatient care.

I specialize in the diagnosis and treatment of a wide range of mental health conditions, including ADHD, depression, anxiety, bipolar disorder, OCD, panic disorder, and PTSD. My approach is grounded in evidence-based practice and emphasizes holistic, collaborative care.

Together, we will develop a personalized treatment plan tailored to your unique needs, goals, and values through a shared decision-making process.

I am committed to creating a supportive, nonjudgmental environment and to addressing disparities in mental health care. If you’re struggling, you don’t have to go through it alone. I’m here to support you with compassion, expertise, and care.

I want you to feel comfortable and understood from the very first conversation we have. My work centers on helping people manage anxiety, lift the weight of depression, and find steady footing in recovery from addiction. I see care as something we build together, not something done to you, so your voice shapes every step of the plan. Whether you are just starting to notice something feels off or you have carried a struggle for years, you deserve a partner who listens closely and treats your goals as the compass. I bring warmth, encouragement, and a genuine belief that change is possible, and I am glad you are here.