Our Team

Roller Weight Loss & Advanced Surgery employs a multidisciplinary, team approach to provide specialized bariatric medical care. Our program coordinator assists each patient with all phases of the program. Dr. Kristin Roller leads the medical side of the team and evaluates each patient thoroughly from a medical perspective prior to weight loss surgery (bariatric surgery). Our dedicated bariatric dietitian provides both pre- and post-op nutritional counseling to help patients maximize their weight loss potential. Our clinical psychologist performs an extensive pre-operative psychological evaluation and counsels patients on behavioral and life-style issues related to weight loss surgery. Post-operatively, the psychologist continues to follow patients, providing guidance and support.

Our program seeks to ensure that patients are making informed decisions, are qualified candidates for surgery and are committed to making the lifestyle changes necessary for long-term weight loss success.

Shanda GuentherShanda Guenther
Chief Operating Officer

A Northwest Arkansas native, Shanda Guenther earned her nursing degree from the University of Arkansas. She later completed a master’s degree in Leadership and Ethics from John Brown University. Upon graduating from Arkansas, Shanda was a labor and delivery nurse at Willow Creek Women’s Hospital. While she loved the direct patient care experience, it was there that her passion for leadership and process improvement began, prompting a change to administration, eventually serving as the Chief Quality Officer for Northwest Hospitals in the NWA area. Most recently she held the title of Assistant Chief Nursing Officer for Northwest Hospital in Springdale, Arkansas. The continuum of care and ability to witness patient’s lives change thanks to weight loss surgery is what drew her to this opportunity. As a member of the Roller Weight Loss team, she plays an integral role in ensuring our clinics are providing an exceptional patient experience and be able to first hand see the life-changing results of weight loss surgery.

Neil HerringtonNeil Herrington

Herrington is a registered and licensed dietitian. He completed his undergraduate in foods and human nutrition from the University of Arkansas where he graduated with summa cum laude honors. He then completed his dietetic internship at the Vanderbilt University Medical Center, where he also practiced in surgical and medical weight loss. Other than working with bariatric weight loss, Herrington also spent time working in a corporate wellness setting through the Blue Cross of Tennessee and its corporate wellness program – Onlife Health. He worked in clinical practice with an emphasis in cardiovascular and diabetic disease management.

Matt JohnsonMatt Johnson

Johnson serves as a dietitian on the Roller Weight Loss team. He helps patients get the most out of their weight loss experience through diet and exercise education and encouragement.

Johnson has worked as a clinical dietitian for five years and specializes in gastrointestinal diseases and metabolic disorders. He has experience with organ transplant patients and has also worked on a nutrition support team with doctors and pharmacists to manage critical care patients. Johnson attended The University of Tennessee at Chattanooga for his degree in dietetics and completed his dietetic internship through the University of Alabama at Birmingham.

Anne MarquartAnne Marquart

Marquart has been a registered dietitian for 15 years, and the majority of her experience involves bariatrics and weight loss. She received her bachelor’s and master’s degrees from Texas Tech University. She was awarded Arkansas’ Recognized Young Dietitian of the Year in 2008 and has served on the Northwest Arkansas District Academy of Nutrition and Dietetics Board. Marquart worked at Roller Weight Loss from 2007-2011 and is happy to be back. She enjoys introducing patients to food as it relates to weight loss surgery, and she feels blessed to be able to follow patients on their journey.

Theresa EarneyTheresa Earney

Earney is a nutritionist and received her bachelor of science degree in food, human nutrition and hospitality with a concentration in dietetics from the University of Arkansas. She works alongside Aubrey to provide our patients a well-rounded nutrition and diet experience. She enjoys helping our patients change their lives through diet and exercise and helps them through all stages of pre and post operative nutrition.

Liz McClainLiz McClain

Liz became a nurse practioner upon earning her master’s degree from Houston Baptist University. She is board-certified in family practice and has a special interest in women’s health and wellness issues.

Sara McDonaldSara McDonald

Sara is a board-certified family practice nurse practitioner and sees patients at the Tulsa office.  She earned her bachelor’s degree from Northeastern State University in Tahlequah, Oklahoma and her master’s degree from Samford University in Birmingham, Alabama.  Sara’s nursing background includes experience in family practice, intensive care, medical-surgical nursing, cardiology and nursing education.

Sandy M. BransonSandy M. Branson

Sandy is an Advance Practice Nurse with training focused on the management of patients with acute and chronic illness. Sandy completed her education at Vanderbilt University and is board certified in Acute Care. Her experience has been focused on wellness and internal medicine.

Amanda E. BrackettAmanda E. Brackett

Brackett is a board certified family practice APN. She earned her master’s degree from the University of Central Arkansas. She has special surgical training from the National Institute of First Assisting in Denver, Colorado.

Elaine ThriftElaine Thrift

Elaine is a board-certified family nurse practitioner and sees patients at the Fort Smith location. She obtained her bachelor’s degree from Oklahoma Wesleyan University and her master’s degree from the University of Central Arkansas. Prior to joining the Roller Weight Loss team, Elaine’s experience included endocrinology and internal medicine. She is also a certified diabetes educator with experience managing Type I and Type II diabetes.