Krista Brown, RD, CSP, LD is a registered dietitian and nutritionist. She is board certified in pediatric nutrition and a certified ModuLife expert for the Crohn’s Disease Exclusion Diet. In addition to general pediatric nutrition, Krista specializes in eating disorders and gastrointestinal diseases, including but not limited to the FODMAP diet, celiac disease, eosinophilic esophagitis, food allergies, and enteral nutrition.

Krista earned her bachelor’s degree in dietetics from University of Idaho. In her free time, she enjoys traveling, running, cooking, being outdoors and spending time with her family.

Tyler Burpee, MD specializes in the management of both common and complex childhood digestive conditions. He is the medical director of St. Luke’s intestinal rehabilitation program that cares for children with short bowel syndrome and intestinal failure. He also has a special interest in celiac disease and inflammatory bowel disease, including Crohn’s disease and ulcerative colitis.

Dr. Burpee is passionate about child advocacy and currently serves as president of the Idaho Chapter of the American Academy of Pediatrics. He has published multiple research papers and book chapters regarding inflammatory bowel disease, infectious diarrhea, and autoimmune liver disease.

Originally from Boise, Dr. Burpee earned a bachelor's degree in philosophy from Dartmouth College, graduating with honors. While at Dartmouth, he was a member of the varsity crew team. After medical school and pediatrics residency training at the University of Washington School of Medicine, Dr. Burpee worked as a general pediatrician for two years with the Indian Health Service on the Navajo reservation in Chinle, Arizona. Next, he trained under world-renowned experts in pediatric gastroenterology during his fellowship at Boston Children's Hospital/Harvard School of Medicine. He also served as an attending physician at Seattle Children's Hospital before moving back to Boise.

In his free time, Dr. Burpee enjoys skiing, running, mountain biking, and adventuring with his wife and two children.

John Collier, MD cares for children and adolescents with a wide variety of gastrointestinal disorders. He values clear, open communication, family and patient empowerment, and shared decision-making. His professional interests include esophageal diseases, functional disorders (disorders of gut-brain interaction), inflammatory bowel disease, and interprofessional communication.

Dr. Collier grew up in Des Moines, Iowa and earned an undergraduate degree at Saint John’s University in Collegeville, Minnesota, where he ran cross country and track and sang in the chamber choir. In his free time, he enjoys backcountry skiing, cooking, and cycling.  He races for Team George’s Cycles and volunteers with Big Brothers Big Sisters.

Barbara Doherty, MSN, CRNP diagnoses and treats pediatric patients with GERD, eosinophilic esophagitis, celiac disease, gluten intolerance, gastrointestinal (GI) allergies, growth concerns, and gastrostomy tube feeds. She particularly enjoys caring for patients with disorders of the brain-gut axis (functional GI disease) including irritable bowel syndrome (IBS), functional dyspepsia, cyclic vomiting syndrome, and abdominal migraines. 

Barbie enjoys building relationships with the children she treats and their families, and empowering them through all stages of growth and development. Barbie explains, “I love children and families. The impermanence of childhood makes each day spent with a child precious. The love and dedication parents have for their children is awe inspiring. I am lucky and blessed to work hand in hand with parents, and to be a part of their child’s healing journey.”

Barbie earned her bachelor’s degree in nursing at Boise State University. During her undergraduate studies, she spent a semester abroad in the Middle East working with children, an experience that inspired her to become a nurse practitioner. She earned her master’s degree as a nurse practitioner from Idaho State University. Prior to joining St. Luke's Children's Gastroenterology, she worked as an NP in pediatric primary care.

In her free time, she enjoys yoga, baking, gardening and playing outdoors with her husband and sons.

Rachel Elledge, MSN, PNP-C is a board-certified pediatric nurse practitioner specializing in pediatric urology with interests in voiding dysfunction, dysfunctional voiding, neurogenic bladder, vesicoureteral reflux, and spina bifida. She manages the bowel and bladder clinic at the St. Luke’s Children’s Pavilion.

Rachel is passionate about providing evidence-based practice and ensuring that both the child and their parents feel supported and heard.

Rachel earner her master’s degree as a nurse practitioner from the University of Missouri – Kansas City and completed her undergraduate studies at Jacksonville University and Goldfarb School of Nursing. Prior to her work as a nurse practitioner, she has worked as a pediatric registered nurse (RN) in the ambulatory pediatric urology clinic as well as several other areas of pediatrics over the past 16 years.

In her free time, Rachel enjoys cycling, hiking, and spending time with husband and their four children.

Erin Lane, MD is passionate about pediatric nutrition and caring for children of all ages with gastrointestinal disorders.

Prior to her medical education, Dr. Lane earned her bachelor’s degree in biochemistry and theology from Boston College. In her free time, she likes to spend time with her family and enjoy the outdoor adventures Idaho has to offer.

Cass R. Smith, MD is a pediatric gastroenterologist who sees a wide variety of pediatric patients. His areas of special interest include inflammatory bowel disease, diseases of the pancreas and liver, eosinophilic esophagitis, neurogenic bowel due to spina bifida, functional abdominal pain and constipation. He performs upper and lower endoscopy, including removal of polyps and control of bleeding, liver biopsies, removal of foreign bodies and care and maintenance of gastrostomy tubes. Dr. Smith asks for and respects input and decisions from children and their parents, supporting them in maintaining an active role in medical care.

At St. Luke's, Dr. Smith has helped lead numerous quality improvement initiatives, working to standardize pediatric gastrointestinal (GI) care. He is also committed to advancing the quality of care throughout Idaho. He travels to Idaho Falls regularly to offer clinic visits and endoscopy to patients in eastern Idaho.   

Dr. Smith completed his bachelor's degree in zoology at Brigham Young University. During medical school at the University of Nevada, Reno, he achieved special qualifications in nutrition and conducted research in natural killer and lymphokine-activated killer cell activity and antioxidants. He completed his residency in pediatrics at the combined University of Nebraska/Creighton University program and his fellowship in pediatric gastroenterology at Children’s Hospital of Wisconsin.  

Henry Thompson, MD is a pediatric gastroenterologist, specializing in gastrointestinal and liver-related conditions and procedures. He enjoys working with children, educating them about their medical conditions and empowering them to own their medical issues. He is particularly passionate about nutrition, physical fitness and moderation of screen time, encouraging his patients and their families to maintain healthy lifestyles. 

Dr. Thompson is committed to educating his colleagues as well, often leading residents and colleagues in care improvement initiatives. He currently serves as the medical subspecialty director at St. Luke's Children's, medical director of pediatric gastroenterology, and co-director of the pediatric cystic fibrosis (CF) program at the St. Luke's Cystic Fibrosis Center of Idaho. He has led multiple cystic fibrosis research studies as principal investigator and supported many others as a sub-investigator.

Prior to his medical education, Dr. Thompson earned a bachelor's degree in biology from Lewis and Clark College. In his free time, he enjoys biking and all the outdoor activities Idaho has to offer.