David received his B.Ag.Sc. (Hons) from the University of Adelaide and a Ph.D. from the University of New England (New South Wales). His Ph.D. investigated nitrogen transfer between tree legumes, associated grass and ruminant animals (goats). This was undertaken in Indonesia as part of a joint Australia-Indonesia project in forage research, aimed at improving the quality and availability of animal feed.
David subsequently worked for the Queensland Department of Primary Industries as a plant physiologist. He focused primarily on plant nutrition of tropical fruit trees (especially mango), and varietal selection. He has also worked as a science educator at James Cook University, which included lecturing in tropical horticulture.
David was once an ardent atheistic evolutionist, before being challenged to look critically at the problems of evolution, and the scientific evidence for creation and the Bible. He went on to work full-time for Creation Ministries International (CMI) in Brisbane, Australia, for over 15 years, serving on the editorial panel of Creation magazine, and was a popular speaker, until his retirement in 2014. He has co-authored The Creation Answers Book and Evolution’s Achilles Heels, and contributed to the book, The Big Argument. David has also contributed many articles for Creation magazine and CMI’s popular website, creation.com.