Carl is the Managing Director of Creation Ministries International (Australia), a position he has held since 1987, when it was called Creation Science Foundation, then Answers in Genesis. He was the founding editor of Creation magazine (in 1978) that now has subscribers in over 140 countries.
Carl's formal qualifications are in medicine and surgery, and he is a past president of the Christian Medical Fellowship of South Australia. He no longer practises medicine, having been in fulltime ministry since 1987. He is in great demand as a speaker on the scientific evidence for Creation/Flood, and its relevance to Christianity. Able to hold both academic and lay audiences, he has lectured extensively in Australia and around the world, and has engaged in a number of public debates with prominent evolutionists.
He is the co-author of The Answers Book, One Blood, Walking Through Shadows, Answers to the 4 Big Questions and author of Dragons of the Deep: Ocean Monsters Past and Present and Stones and Bones. These are among the most popular creation books of recent times and have been translated into many languages. He has also authored numerous articles in both Creation magazine and the Journal of Creation (formerly TJ).