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Addiction Treatment Staff

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Zachary Ragan

Facility CEO

Brian Fuller, MD

Medical Director

Jaime Gibbons

Director of Alumni Services

Staci King

Nurse Administrator

Brandi Weber, FNP-C

Clinical Nurse Manager

Nancy Kirby

Program Director

Joel Wilkerson

Clinical Nurse Manager

Lauren Bentley, LCSW

Director of Clinical Operations

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Zachary Ragan

Facility CEO

Zack is the Facility Chief Executive Officer for the Ranch Tennessee and P.A.T.H. Nashville. He is a Licensed Alcohol and Drug Abuse Counselor in Tennessee. He also holds a bachelor’s degree in psychology and his Master of Business Administration from Tennessee State University. Zack has worked in behavioral health for nearly a decade at all levels of care. His specialty is educating, training and developing staff to better serve clients dealing with addiction and mental health disorders. His treatment philosophy incorporates addressing the whole person, not just the disease of addiction or mental health, by treating the person’s body, spirit and soul.

Brian Fuller, MD

Medical Director

Dr. Fuller is board certified by the American Board of Psychiatry and Neurology. He completed medical school at the University of Tennessee Health Science Center and residency at Vanderbilt University. Additionally, he has completed the Nashville Advance Psychodynamic Psychotherapy Program, a two-year intensive program to better integrate traditional psychotherapy into his psychiatric practice. Dr. Fuller began his post-residency career in psychiatry running a psychotherapy-oriented private practice. Looking to help more people than he could working alone yet still provide treatment that emphasizes the importance and value of talk therapy, he joined The Ranch in 2017.


Dr. Fuller is passionate about helping people who have survived trauma and/or are struggling with addiction and strongly believes that the life we all deserve is within reach, no matter the adversity that one must overcome. He views medications as tools rather than solutions and his prescribing philosophy is to use the lowest dose necessary of non-addictive medications to help aid the process of recovery.

Jaime Gibbons

Director of Alumni Services

Jaime Gibbons – Director of Alumni Services since September 2019. Jaime focuses on keeping clients engaged post discharge through follow up contact, alumni meetings, events, service opportunities and our Rooted app. The Rooted at The Ranch Alumni program provides resources and support for all clients who choose to opt-in. Jaime is a certified Recovery Coach & Trainer, Certified Peer Recovery Specialist for the state of TN and also serves as a board member for Treatment Professionals in Alumni Services

Staci King

Nurse Administrator

Staci graduated as an LPN in 2014 then joined The Ranch in June of 2016 as a nurse on the floor, moving up to her current position as Nurse Administrator in 2020. Staci has three grown children and considers her husband ‘a saint’. Being in recovery herself for 10 years, Staci can relate to the fears and uncertainty around working on one’s self. To quote Staci, ”I feel it is my mission to give hope to the hopeless and show love to the unlovable. Someone did that for me.”

Brandi Weber, FNP-C

Clinical Nurse Manager

Brandi Weber, FNP-C is a certified family nurse practitioner providing acute and primary care for our clients. Certified through, and a current member of, the American Academy of Nurse Practitioners, Brandi graduated with her AD in Science from Volunteer State Community College and BSN degree from Tennessee State University. She participated in the nurse residency program at Vanderbilt working in the emergency department and level one trauma center. She obtained her master’s degree for Advanced Practice Nurse at Vanderbilt School of Nursing’s Family Nurse Practitioner program. Previous employment includes Northcrest Physician Services and family nurse practitioner in primary care in Robertson and Cheatham Co for over four years. She later worked for Urgent Team in Springfield, TN in both acute and primary care before coming to The Ranch. “I am very blessed and humbled to be a part of such a compassionate and caring establishment where the client comes first. I am honored to have the opportunity to help the client achieve optimal health during their time of healing and recovery.”

Nancy Kirby

Program Director

Over 30 years of experience serving in capacities such as Director Of Clinical, Forensic, and Program Services with a demonstrated history of working in the government administration and private sector industry. Specific concentration in state forensic settings, developmental centers, and mental health institutes. Skilled in Nonprofit Organizations, Crisis Intervention, Dialectical Behavior Therapy, Forensic Evaluations, Court Testimony, and Psychological Assessment. Strong operations professional with a Master’s of Arts in Clinical Behavioral Psychology and a Doctorate of Education (Ed.D.) focused in Psychology from Tennessee State University.

Joel Wilkerson

Clinical Nurse Manager

Joel has been with the Ranch for 3.5 years working his way from a Resident Assistant, to Lead RA, to House Manager then to his current role as Residential Supervisor. Prior to working at The Ranch, Joel spent 10 years in Public Utilities as a lead/trainer for meter technicians. There he also gained significant experience in customer relations. Joel served in the US Army and has 13 years of experience with Hickman County Rescue Squad.

Lauren Bentley, LCSW

Director of Clinical Operations

Lauren is the Director of Clinical Operations for the Ranch Tennessee. She is a Licensed Clinical Social Worker and received her master’s degree from The University of Tennessee College of Social Work. She has a passion for working with individuals who have experienced trauma and is trained in EMDR. Her philosophy includes treating the whole person, not just the disease of addiction or mental health, by treating the person’s body, spirit, and soul. In her spare time, Lauren enjoys practicing yoga, hanging out with her dogs, and traveling with her husband.