Addiction therapists & psychiatrists in Prosper, TX

I am a board-certified Family Psychiatric Mental Health Nurse Practitioner. I've worked in different practice settings, including private practice, community mental health, homeless and correctional services, and addiction. I treat and manage a range of disorders ( depression, anxiety, bipolar, schizophrenia, PTSD, OCD, addictions, etc).

I believe therapy should be tailored to each client individually as it is not a “one size fits all" solution. Whether or not you have a “diagnosis”, therapy is incredibly important and is a space where you get to talk about your everyday stressors or your major traumas. It’s up to you. I am dual licensed in Texas and New York.

I work with adults, couples, and teens, helping people untangle challenges that often feel overwhelming, interconnected, or hard to name. I believe most struggles don’t exist in isolation—they affect our relationships, our emotions, and how we move through the world. My role is to truly get to know you, understand your story, and support you in creating meaningful, lasting change.

My background is both clinical and academic. I hold a Master’s degree in Clinical Mental Health Counseling, along with graduate degrees in Philosophy and Sociology, and a bachelor’s degree in Psychology and Communications. I’m also a doctoral candidate in Educational Psychology. This combination allows me to look at your concerns through emotional, relational, and systemic lenses—not just symptom-focused ones.

I specialize in trauma work, relationship therapy, and working with preteens and teens—who are often misunderstood but incredibly important to support early. I’ve trained in EMDR, Gottman Method Couples Therapy, Emotionally Focused Therapy (EFT), CBT, Art Therapy, and Conflict & Dispute Resolution. Above all, I value creating a space where you feel safe, respected, and genuinely supported.

Welcome! My name is Marquin Decker and I hold a Masters in Clinical Mental Health Counseling from the University of North Texas. I am Licensed Professional Counselor and am EMDR Trained.

I didn’t grow up with the healthy mother-daughter relationship I longed for, and that experience shaped my desire to help others find healing. Today, I’m passionate about helping my clients build the connection, understanding, and relationship they deserve. I specialize in working with women and teens as well as incorporating equine and animal-assisted therapies. I am also trained in play therapy and can work with children ages 6-10yo.

I graduated with my Masters of Science in Counseling from Southern Methodist University in 2014 and am a Licensed Professional Counselor-Supervisor and Licensed Chemical Dependency Counselor. I have worked with clients in both inpatient and outpatient settings and specialize in therapeutic approaches for adults (18+) experiencing depression, anxiety, trauma, stress and life-adjustment issues, and relational stressors. I offer both in-person and telehealth options for sessions.