Dr. Rengen is Board Certified in Gastroenterology and Internal Medicine. He is a graduate of Western University of Health Sciences of Osteopathic Medicine. He completed an internship and an internal medicine residency at Johns Hopkins University in Baltimore, Maryland. He has completed his Gastroenterology Fellowship at the University of Texas/MD Anderson Cancer Center in Houston, Texas. He has participated in numerous research projects and Gastroenterology workshops. He is married and has two children.