Barnabas Piper was a regular contributor to the WORLD web-site for years and is also the son of the well-known pastor and occasional WORLD contributor John Piper. In fact, it was in his role as a 'PK,' or pastor's kid, that Barnabas Piper wrote his first book, "The Pastor's Kid: Finding Your Own Faith and Identity." Piper has gone on to have a robust writing and speaking career. His latest book is "The Curious Christian: How Discovering Wonder Enriches Every Part of Life." Piper lives and works for Lifeway Christian Resources in Nashville, Tennessee.