Mark Gilbert works for Certainty4Eternity, an organisation established to help churches share the Gospel with people from a Roman Catholic background. Mark grew up as a committed Roman Catholic, but despite this did not hear the Gospel until he started University. He trained as a doctor before retraining as a minister, and has served in Anglican churches in Sydney since 2000. He currently works as an Evangelist on the Northern Beaches of Sydney and partners with Churches to help them to reach more Roman Catholics with the Gospel. Mark has published a number of books and articles to help including; The God Who Saves, The Road Once Travelled and Stepping Out in Faith. He has also spoken at conferences in Australia, the United States and Europe.