Dr. Sullivan is an Associate Professor of Medicine at the University Of Colorado School Of Medicine and is the director of the Gastroenterology Metabolic and Bariatric Program.  She graduated with a degree in Nutrition from the University of Wisconsin Madison where she studied the effect of caloric restriction on intracellular insulin signaling in a primate model.  She matriculated to Washington University School of Medicine for medical school and stayed through residency and fellowship to continue doing research in obesity and metabolism.  She joined the faculty at Washington University in 2004 and moved to the University of Colorado School of Medicine in 2016.

She has held both KL2 and K23 funding investigating the metabolic effects of exercise on nonalcoholic fatty liver disease and an isocaloric diet high in high-fructose corn syrup in patients with obesity and nonalcoholic fatty liver disease using in vivo metabolic techniques including hyperinsulinemic euglycemic clamps and hepatic lipoprotein tracer studies.  In addition, she has been involved a site primary investigator or sub-investigator on eight multi-center industry sponsored trials, one pilot study, and several post-market approval studies of endoscopic bariatric therapies for weight loss.  

Dr. Sullivan developed the first endoscopic bariatric therapy program at Washington University School of Medicine and was recruited to The University of Colorado school of Medicine to establish the Gastroenterology Metabolic and Bariatric Program.  She serves as the current chair of the board for the Association for Bariatric Endoscopy, is a counselor for the Obesity Metabolism and Nutrition Section of the AGA institute, and is the recent past chair of the Bariatric Surgery Section of The Obesity Society.