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Board Certified Psychiatrists and Interdisciplinary Mental Health staff

Are you struggling with a particular mental health issue, or are experiencing difficulty in a family or personal relationship? The Board Certified Psychiatrists and interdisciplinary staff at Precise Clinical Neuroscience provide comprehensive mental health treatment for you and your family. Our team of psychiatrists, licensed professional counselors, and board certified mental health nurse practitioners will work with you to find the treatments to help you move toward a healthier and more satisfying life.

At Precise Clinical Neuroscience Specialists, your mental health care is coordinated with all providers involved to achieve integrated services. Our psychological, behavioral and psychopharmacological treatments are based on the latest research within the context of a safe, trusting and respectful therapeutic environment.

Meet some of the experienced and highly trained interdisciplinary staff at Precise Clinical Neuroscience Specialists:

Dr. Joseph A. Kwentus, the founder of Precise Clinical Neuroscience Services, is board certified in myriad disciplines including Psychiatry, Neurology, Geriatric Psychiatry, Addiction Psychiatry, Neurophysiology, Forensic Psychiatry, Pain Management, Psychosomatic Medicine, Addiction Medicine, Clinical Psychopharmacology, Sleep Disorders Medicine, and Polysomnography.

Dr. Kristen Bevill serves as the Medical Director for Precise Clinical Neuroscience Specialists Opiate Dependency Treatment Clinic. Her experience includes Adolescent, Adult and Geriatric Psychiatry . She also has inpatient psychiatric privileges and services at Baptist Medical Center and Brentwood Behavioral Health in Jackson, MS.

Joyce C. Vaughn, PMHNP-BC, is board certified as a Psychiatric Mental Health Nurse practitioner and has held many positions in academia as an Assistant Professor in Nursing and Director of Nursing Programs for nearly 24 years. She has worked in multiple healthcare facilities in Mississippi and Alabama in her career.

William Johnson, PMHNP-BC, is board certified as a Psychiatric Mental Health Nurse practitioner for nearly 20 years. He has worked in multiple healthcare facilities and in-patient hospitals in Mississippi including Baptist Geriatric In Patient Unit, Brentwood Behavior Hospital, and Region 8.

  • Roderick Green, PMHNP-BC- Psychiatric Nurse Practitioner

Roderick Green, PMHNP-BC, is board certified as a Psychiatric Mental Health Nurse practitioner at Precise Clinical Neuroscience Specialists and has held many positions in academia as an Assistant Professor in Nursing and Director of Nursing Programs for nearly 24 years. She has worked in multiple healthcare facilities in Mississippi and Alabama in her career.

  • Carri Myers, PMHNP-BC- Psychiatric Nurse Practitioner

Joyce C. Vaughn, PMHNP-BC, is board certified as a Psychiatric Mental Health Nurse practitioner and has held many positions in academia as an Assistant Professor in Nursing and Director of Nursing Programs for nearly 24 years. She has worked in multiple healthcare facilities in Mississippi and Alabama in her career.

  • Angie Green, PMHNP-BC- Psychiatric Nurse Practitioner

Joyce C. Vaughn, PMHNP-BC, is board certified as a Psychiatric Mental Health Nurse practitioner and has held many positions in academia as an Assistant Professor in Nursing and Director of Nursing Programs for nearly 24 years. She has worked in multiple healthcare facilities in Mississippi and Alabama in her career.

Dr. Ron Mumbower, Ph.d., LMFT is a Licensed Marriage & Family Therapist in Mississippi specializing in Marriage and Family counseling, with a focus on individual, couples, and family counseling. His Couples Counseling specialties includes Newly-Wed Counseling, Pre-Marital Counseling, Marriage Counseling, Couples Conflict, Infidelity, Affairs, & Divorce. Dr. Mumbower is well known in the Jackson, MS and surrounding areas for his specialization in Grief & Loss Counseling such as: Terminal Illness Diagnosis, Anticipatory Grief, Sudden Loss, Bereavement, & Mourning. He is also well versed in Therapy for Men’s Issues such as Sexual Issues, Erectile Dysfunction, Pornography Addiction, Sex Addiction, Sexual Abuse, and Sexual Violence.

Nicole Simonson is a Licensed Professional Counselor (LPC) and a Nationally Certified Counselor (NCC) with over 9 years of comprehensive clinical experience. She is a professional member of the American Counseling Association (ACA). Nicole’s educational background includes; a Bachelor of Arts degree in Communication, Master of Science in Counseling Psychology, and an Education Specialist in Counseling degree all received from Mississippi College. She is currently pursuing a Doctor of Professional Counseling degree with a specialization in Trauma.

Dr. Karen Richardson is a Licensed Professional Counselor specializing in assessment and triage and the rendering of individual, marital family and group psychotherapy. Dr. Richardson has been affiliated with Precise Clinical Neuroscience Specialists since 2006.


Precise Clinical Neuroscience Specialists provides several Psychiatrists in central Mississippi. Visit us to find an ADHD psychiatrist, licensed clinical psychologist, psychiatrist Jackson MS, geriatric psychiatry, sleep disorder treatment, addiction Psychiatrist and major depressive disorder psychiatrist.

Our clinic helps people with substance abuse counseling, medication managment, opiate dependency treatment, counseling and provides clinical psychologists that accept insurance.


Precise CNS serves the Central Mississippi region including Brandon, Madison, Ridgeland, Jackson Mississippi, Clinton in Madison & Rankin Counties MS.

Precise CNS Mississippi Psychology Patient "I was looking for some help getting over a tragic loss. The Mississippi Psychiatrist team at Precise CNS helped get my life back."
2011 Client - Jackson, MS