Dr. Santillan received his medical degree from University Mayor of San Simon in Cochabamba, Bolivia. He completed his externship, internship, and residency in Internal Medicine at Kettering Medical Center in Kettering, Ohio. He joined Pulmonary & Medicine of Dayton as an Internal Medicine Hospitalist in 2004. He has been a preceptor to the students of the Physician Assistant Program for the Kettering College of Medical Arts. He is fluent in English and Spanish.