Dr. Diehl earned a medical degree from the University of Oklahoma College of Medicine. He also completed an internship and residency training at the University of Oklahoma College of Medicine. Dr. Diehl is board certified in pediatrics and his medical areas of interest include family-oriented pediatric care from birth to twenty-one years of age.

In his personal time, Dr. Diehl enjoys Nordic skiing, backpacking, bicycling, and canoeing.