Providers
Dedicated To Healing
Our providers at Tyler Holmes Memorial Hospital truly are dedicated to healing. From board certified physicians to certified nurse practitioners, our team of healthcare professionals are focused on individual remedies and solutions to all patients. They also understand that caring is most important, and they bring their expertise and training to serve our local area needs. We invite you to see how they can best care for you, your family, and your healthcare needs.
DR. DEWAYNE GAMMEL
Family Medicine
Dr. Gammel is board certified in Family Medicine, and a diplomat of the American Academy of Family Practice. He is a member of the Southern Medical Association, Mississippi State Medical Association, and the Mississippi Academy of Family Practice. Dr. Gammel attended medical school at the University of Mississippi, and he completed his residency at North Mississippi Medical Center in Tupelo, Mississippi.
DR. STEVEN RUSHING
Family Medicine
Dr. Rushing graduated from the University of Mississippi Medical Center in 1991 and completed his Family Medicine residency at the University of Tennessee in 1994. He is board certified in Family Medicine, and is also certified in ACLS, PALS and ATLS. He is currently a member of the Mississippi State Medical Association and American Academy of Family Physicians.
Dr. Cassada
Psychiatry
Dr. Cassada graduated from the University of South Carolina School of Medicine in 1991 and completed her General Psychiatry residency in 1995. She is board certified in Psychiatry and Neurology. She is a member of the American Psychiatric Association, the Mississippi Psychiatric Association and the Southern Psychiatric Association. She served on the Mississippi State Board of Mental Health from 2005 to 2015, acting as the Chairman in 2009. She enjoys gardening and traveling in her spare time. She is married to her husband, Ron, and has two adult children.
JULIA JOHNSON, NP-Hospitalist
Nurse Practitioner
Julia Johnson received a Bachelor’s Degree in Nursing from the University of Mississippi Medical Center. She then went on to further her career earning a Master of Science in Nursing, graduating with academic honors. Julia is a board-certified Family Nurse Practitioner credentialed by the American Academy of Nurse Practitioners. She is a member of the Mississippi Nurse’s Association, Mississippi Association of Nurse Practitioners and American Academy of Nurse Practitioners.
In addition to practicing at Tyler Holmes Carrollton Clinic, Julia enjoys spending time with her husband and children, teaching Sunday school at First Baptist Church of Winona, serving the community through Junior Auxiliary of Winona and playing tennis.
STEPHANIE MYERS, NP
Nurse Practitioner
Stephanie Myers received an Associates’s Degree in Nursing through Holmes Community College. After working for almost a decade in nursing care, she pursued her interest in advancing her nursing career and earned her Master’s Degree of Nursing through the University of Mississippi Medical Center.
She is certified through The American Academy of Nurse Practitioners National Certification Board. Stephanie is a member of the Mississippi Nurses Association.
Brittany Allbritton, NP-C
Nurse Practitioner
Brittany Allbritton began her nursing career in 2011 as a licensed practical nurse. For her first three years as an LPN, she worked at a family practice clinic in Coffeeville, MS. In 2014, she received her Associate’s Degree in Nursing at Holmes Community College. During her first two years as an RN, she worked as a school nurse at Water Valley High School. Brittany has extensive experience in the fast-paced field of emergency medicine. She has spent the majority of her nursing career working in the Emergency Departments of Baptist Memorial Hospital – North Mississippi, The University of Mississippi Medical Center – Grenada, and Tyler Holmes Memorial Hospital. In June 2024, Brittany expanded her clinical expertise by earning a Master of Science in Nursing from South University. She has certificates in ACLS, PALS, and TNCC. Brittany is a board-certified family nurse practitioner credentialed by the American Academy of Nurse Practitioners.
Sabrina Matthews
Nurse Practitioner
Sabrina Matthews has spent her entire career in Nursing and caring for others. She was a Registered Nurse for 10 years before she received her Master’s of Science in Nursing-Administration in 2011 from Delta State University in Cleveland , MS. Sabrina worked for Greenwood Leflore Hospital for a few years and then went back to Delta State to complete the Post Master’s Family Nurse Practitioner training and graduated with honors in 2016. Sabrina is a Board-Certified Family Nurse Practitioner credentialed by the American Academy of Nurse Practitioners. She is an active member of the Academy of Nurse Practitioners and the Mississippi Nurses Association. Sabrina is married and has two children. Sabrina will be working in the Winona Family Practice Fast Track clinic.