Faculty Biographies

​Blair Fennimore, MD



Blair Fennimore, MD, received his bachelor’s degree from the University of North Carolina at Chapel Hill.  He studied medicine at the Wake Forest University School of Medicine and completed his internal medicine residency and gastroenterology fellowship at the University of Colorado.  As part of the University of Colorado’s Crohn’s and Colitis Center, Dr Fennimore’s clinical interests are focused on the diagnosis and multi-disciplinary management of inflammatory diseases of the GI tract including Crohn’s and Ulcerative colitis.  He is particularly interested in the management of IBD during pregnancy and lactation and primary-sclerosing cholangitis associated inflammatory bowel disease including post liver transplant IBD management. Dr Fennimore’s research interests focus on inter-organ cross-talk mechanisms; specifically in understanding inflammatory cross-talk between the liver and intestine in primary sclerosing cholangitis associated inflammatory bowel disease. In true Colorado spirit, his hobbies include snow-boarding, fly fishing, and triatholon.

​Sarah Funk, RD, CNSC



Sarah Funk, RD, CNSC, received her Bachelor of Science Degree in Human Nutrition and Food Science at New Mexico State University. She completed her dietetic internship at Oregon Health and Science University in Portland, Oregon and has been a practicing clinical dietitian since 2003. She has a broad experience in the field of clinical nutrition but has always had a special interest in surgical and GI nutrition. Working at UCH has allowed her to gain more experience with IBD patients and recognizing the need for one on one counseling to ensure a nutrition plan meets their specific needs. In her spare time, Sarah enjoys snowboarding, running, and learning to play the guitar.

​Mark Gerich, MD, MBA



Mark Gerich, MD, MBA, received his undergraduate degree from Cornell University and a dual MD/MBA degree from McGill University in Montreal, Quebec, Canada. He received his internal medicine training at the University of California Davis Medical Center and completed his fellowship in gastroenterology and hepatology at the University of Colorado in 2011. After completing an advanced IBD fellowship at Cedars-Sinai Medical Center in Los Angeles, Dr. Gerich joined the faculty in the Division of Gastroenterology and Hepatology at the University of Colorado, where he now serves as the Clinical Director of the University of Colorado Crohn's & Colitis Center and conducts clinical and translational research focused on the pathogenesis and treatment of IBD. Dr. Gerich is a native of Minnesota who spent formative years in Pittsburgh, upstate New York, and Quebec. In addition to his family and the Pittsburgh Steelers, Dr. Gerich’s personal interests include alpine and backcountry skiing, hiking, and fly-fishing.

​Alexis Oonk, MSN, FNP​



Alexis Oonk, MSN, FNP, received her Bachelors of Science in Biology at Rhodes College in Memphis, Tennessee prior to attending a nursing program at University of Southern Maine. While at University of Southern Maine, she completed a Master’s of Science in Nursing to become a nurse practitioner. She worked as a registered nurse at Maine Medical Center throughout her graduate program.  After becoming credentialed as a Family Nurse Practitioner, Alexis moved to Colorado and spent three years working at a general GI community practice caring for patients with a variety of GI disorders. During this time, she discovered that working with patients with inflammatory bowel disease (IBD) is a passion of hers and was excited to join the IBD team here at University of Colorado Crohn’s and Colitis Center in 2013.  Alexis’ clinical interests include providing high quality, evidence based care to our patients within the Crohn’s and Colitis Center. She finds providing care for our complex inflammatory bowel disease patients with attention to their multidisciplinary needs to be very rewarding.  She supports research efforts of the IBD clinic as well by performing screening and follow-up visits within the context of our clini​cal trials. Outside of the work, Alexis’ hobbies include skiing, yoga and hiking with her husband and dog.

John Sabel, MD



Dr. John Sabel received his medical degree from the University of Virginia and his internal medicine and gastroenterology specialty training at Baylor Affiliated Hospitals at the Texas Medical Center in Houston, Texas. He then moved to Colorado where he was in private practice with South Denver Gastroenterology.   John is Board Certified in both internal medicine and gastroenterology and has received honorary fellowships from the American College of Gastroenterology (ACG), the American Gastroenterological Association (AGA) and the American College of Physicians (ACP). After 35 years in private practice, he joined the University of Colorado Crohn's and Colitis Center on a volunteer basis as an Associate Clinical Professor to help with the training of GI fellows in the management of IBD patients and also to participate in the review of evaluation and treatment options for complex IBD patients at our weekly multidisciplinary IBD Conference.  John has served on the Boards of the Colorado Health Foundation and the Rocky Mountain Chapter of the Crohn's and Colitis Foundation of America (CCFA), and he is the longtime Chairman of the Rocky Mountain CCFA Medical Advisory Committee (CMAC).  In 2013, he was honored with a Lifetime Achievement Award from the Rocky Mountain Chapter of the CCFA, who have also honored him as Physician of the Year.

Frank I. Scott, MD, MSCE

Frank Scott IMG


​Frank I. Scott, MD, MSCE, received his undergraduate degree from the University of Pennsylvania and then attended medical school at Temple University in Philadelphia.  After completing his internal medicine residency at Weill Cornell Medical Center at New York-Presbyterian Medical Center, Dr. Scott returned to Philadelphia for his gastroenterology fellowship at the University of Pennsylvania, where he then also completed an advanced fellowship in inflammatory bowel diseases.  During this time he also completed his Masters' in Clinical Epidemiology. He was on faculty at the Perelman School of Medicine at the University of Pennsylvania from 2012 to 2015 as an Instructor of Medicine and Assistant Professor of Medicine and Epidemiology before joining the Crohn's and Colitis Center at the University of Colorado in January 2016.