Skyline Endoscopy Center partners with the physicians of Centers for Gastroenterology in Loveland to provide our patients with the highest quality of care.  Our physicians are board certified in Internal Medicine with additional board certification in the sub-specialty of Gastroenterology.  Many of our physicians have developed extensive clinical sub-specialization in fields such as inflammatory bowel disease, esophageal disorders, fecal incontinence, liver and biliary tract disease, and pancreatic disease.

With their advanced training and skills, our physicians provide excellent care in digestive health.

Dr. Sean Caufield - Physicians

Dr. Sean Caufield


Dr. Caufield received his undergraduate degree in Biology from the University of Notre Dame in Notre Dame, Indiana.  He earned his medical degree in 2005 from the Stritch School of Medicine in Loyola, Illinois. Dr. Caufield completed his internship and residency at the Naval Medical Center Portsmouth in Portsmouth, Virginia. He then finished his Gastroenterology Fellowship at the Naval Medical Center in San Diego, California in 2013.  Dr. Caufield served an additional three years in the Navy, concluding his military career as the Director of Endoscopy at the Naval Medical Center in Portsmouth, Virginia.  He is a member of the American College of Gastroenterology and the American Society of Gastrointestinal Endoscopy. Dr. Caufield joined Centers for Gastroenterology in 2016.

Dr. Daniel Langer - Physicians

Dr. Daniel A. Langer


Dr. Daniel A. Langer was raised in Colorado and received his undergraduate degree from Metropolitan State College of Denver in 1996.  In 2001, he received his medical degree from the University of Colorado Health Sciences Center and was elected to the Alpha-Omega-Alpha medical honor society.  He completed his internal medicine internship and residency, also at the University of Colorado, in 2004.  From 2004–2008 he received fellowship training in Gastroenterology and Hepatology at the Mayo Clinic in Rochester, Minnesota.  He focused on the study of liver disease and has published several peer-reviewed papers.  He received the J. Arnold Bargen award for excellence in research.  He then moved back to Colorado to join Centers for Gastroenterology in 2008.  He is board certified Gastroenterology.  He is a member of the American Gastroenterological Association, American College of Gastroenterology, and the American Society for Gastrointestinal Endoscopy.

Dr. Crystal North


Dr. Crystal North received her BS in Molecular and Cellular Biology from the University of Alaska in Fairbanks.  She earned her medical degree from Midwestern University in 2002 and completed her internal medicine residency training in 2005 at Providence St. Vincent Medical Center in Portland, Oregon.  Dr. North finished her Gastroenterology fellowship training at Midwestern University in Chicago, Illinois in 2008.  She is a member of the American Gastroenterological Association and the American College of Gastroenterology. Dr. North is board certified in Gastroenterology.  In addition to enjoying the full spectrum of Gastroenterology, she has a particular interest in treatment for fecal incontinence and colon cancer screening.  Dr. North joined Centers for Gastroenterology in 2009.

Dr. Stephen Sears - Physicians

Dr. Stephen Sears


Dr. Stephen Sears received his BS from James Madison University in Harrisonburg, Virginia.  He earned his medical degree in 1995 from the Uniformed Services University of the Health Sciences in Bethesda, Maryland.  Dr. Sears completed his internship and residency at Eisenhower Army Medical Center in Augusta, Geogia.  He then finished his Gastroenterology Fellowship at Brooke Army Medical Center in San Antonio, Texas in 2001.  Dr. Sears served an additional seven years in the Army, concluding his military career as Chief of Gastroenterology at Madigan Army Medical Center in Tacoma, Washington.  He is a member of the American College of Gastroenterology and the American Society of Gastrointestinal Endoscopy.  He is board certified in Gastroenterology.  Dr. Sears joined Centers for Gastroenterology in 2008.

Dr. Lewis Strong - Physicians

Dr. Lewis Strong


Dr. Lewis Strong has been practicing gastroenterology in Loveland, Colorado since 1991.  Dr. Strong earned his medical degree from Case Western Reserve University School of Medicine in Cleveland, Ohio.  He completed his residency program at the University Hospitals of Cleveland.  He received his Fellowship training in Gastroenterology from Case Western Reserve University School of Medicine.  Dr. Strong is a member of the American Gastroenterological Association.  He is board certified in Internal Medicine and Gastroenterology.  He has a particular interest in digestive diseases, diseases of the liver and colon cancer screening.  Dr Strong is a founding partner of Centers for Gastroenterology.

Dr. Ana Huerta Alardin


Dr. Ana Huerta Alardin was born and raised in Tampico, Mexico.  She earned her medical degree from the Universidad Autonoma de Tamaulipas, Facultad de Medicina, Tampico, Tamaulipas Mexico.  She completed her Internal Medicine residency at Texas Tech University Health Science Center, El Paso, Texas in 2011. She then finished her Gastroenterology and Hepatology  Fellowship at the University of Iowa Hospitals and Clinics, Iowa City, Iowa in 2014.  She worked as a Gastroenterologist at Allen Digestive Health and Cedar Valley Medical Specialists from 2014-2017.  She is Certified with the American Board of Internal Medicine and Gastroenterology.   She will be providing care at our Greeley office location.  She joined Centers for Gastroenterology in 2018.  Se habla Espanol!