Anxiety and depression therapists and psychiatrists in Lewisville, TX

I have 26 years of experience working in an elementary school as a teacher and counselor. I am familiar with the school setting and can help children and parents navigate school situations that include evaluation for learning disabilities, academic testing, organizational skills, time management, course selection for secondary students, executive functioning skills, and peer relationships.

In my time as a counselor, I have helped children in a variety of situations including changes in family dynamics, divorce, blended families, death of a loved one, suicide of a family member, preparation for a funeral, life changes due to illness, abuse, etc.

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.

Finding the right mental health provider can feel overwhelming, especially if you've tried therapy or medications in the past without getting the relief you were hoping for. My goal is to help you move beyond simply managing symptoms and toward feeling like yourself again.

I am a dual-certified Psychiatric Mental Health Nurse Practitioner (PMHNP-BC) and Family Nurse Practitioner (FNP-C) with over 16 years of healthcare experience. I specialize in treating adults with depression, anxiety, trauma, ADHD, insomnia, OCD, and treatment-resistant mood disorders. My advanced psychiatric training was completed through Monmouth University and Wilkes University, where I focused on Evidence-based psychiatric care.

I believe that effective treatment starts with understanding the whole person not just the diagnosis. Together, we'll explore the biological, psychological, and lifestyle factors contributing to your symptoms and develop a personalized treatment plan that fits your goals. My approach combines thoughtful medication management with practical therapeutic strategies that you can apply in everyday life.

For individuals whose depression has not improved after trying multiple antidepressants, I also evaluate and provide treatment options such as Spravato (esketamine) when clinically appropriate. My focus is always on finding the safest, most effective treatment based on your unique needs.

Patients often describe me as warm, approachable, honest, and solution focused. I strive to create a supportive, judgment-free environment where you feel heard, respected, and actively involved in your treatment decisions. Whether you're seeking help for the first time or looking for a new approach after previous treatments haven't worked, I'm committed to helping you build lasting emotional wellness and improve your quality of life.

I earned a Masters degree in Clinical Mental Health Counseling. I have experience working with adults who are struggling with trauma and grief.