The genre of the book of Acts is Narrative History with several Sermons. Luke, the author of the Gospel of Luke, was a doctor and Gentile. He wrote this book circa 60-62 A.D. It is Luke's sequel to the Gospel of Luke. It is titled "Acts" to emphasize that this book records the "Acts of the Apostles through the work of the Holy Spirit". The key personalities of Acts are Peter, Paul, John, James, Stephen, Barnabas, Timothy, Lydia, Silas, and Apollos. Luke wrote the book of Acts (Acts of the Apostles) to record how believers were empowered by the Holy Spirit, worked to spread the Gospel of Christ, and are a model for the future church. The book of Acts is also the history of the birth, the founding, and the spread of the Church from Jerusalem to Rome. It also records the transition of the Church from being almost exclusively a Jewish institution into becoming a Gentile and an international institution. Consequently, it records the transition of Christianity from a Jewish religion into an international faith. The Gospel of salvation is for all because Jesus Christ is Lord of all.