Revd Dr Mark Griffiths is a Practical Theologian. He is tutor in Missional Research and Practical Theology and also oversees Children, Young People and Family Ministry at St Padarn's Institute, the training arm of the Church in Wales. He has led and been involved in leading several growing churches, holding positions from Children's Pastor and Associate Minister, to Senior Leader and was New Wine's Head of Children and Family Ministry for 13 years. He has written 9 books primarily on family ministryand its links to church growth.

“Changing Lives is easy to read, covers all the key issues in lots of practical detail, and is full of great stories and wise advice. But that is only the start. What makes this book essential reading is that Mark not only shows clearly why children’s ministry is vital, but leaves you believing that it is possible. Great theology made practical, based on solid research, wrapped in infectious optimism.”