Gregory was born in Australia to Dutch parents. He grew up in Wagga Wagga, among the sheep and wheat farmers of New South Wales. After studying chemistry at university he worked in a hospital pathology laboratory. At the same time he volunteered with St Vincent de Paul helping to organise and run kids‘ camps for those children who had never had a holiday. In trying to find a way to bring these two worlds of science and faith together Gregory found the Jesuit ideal of “finding God in all things” to be a possible solution. He entered the Society of Jesus in 1996 in Sydney and was ordained in 2008 in Wagga Wagga. He has since worked in Jesuit parishes in Brisbane and Perth, and just completed a Masters degree in Science and Religion at Edinburgh University.