Paul Miller, after graduating from college, taught at inner-city Christian schools in Philadelphia for 10 years. With a group of parents, he started Spruce Hill Christian School (K–8), an inner-city, multiracial school where he was principal and teacher. In 1983, he helped his father found World Harvest Mission, serving as associate director from 1983 until 1996. During his time at World Harvest, Paul wrote several discipling courses, including a course on grace called Sonship. He is the author of several books, including The Love Course and A Praying Life.