John Mark wrote the book of Mark to encourage the Christians in Rome while on a missionary journey there with Paul between AD 55 and 65. His main aim was to reveal who Jesus was. The book is a collection of the many things Jesus did to impact the lives of the Jews. The first half of the book seeks to reveal the identity of Jesus and ends with Him asking Peter who the people think He is and who Peter thinks He is. Mark 8:27-30. Who is Jesus to you?