Donald Calbreath received his Ph.D in biochemistry from Ohio State University in 1968 background in clinical laboratory medicine. He was a Chemistry professor at Whitworth University from 1984-2006. After retiring in 2006, he wrote homeschool materials from 2006-2012 and taught homeschoolers online from 2010-2012. In his free time, he enjoys reading mystery novels, playing guitar, and collecting traditional Southern music.