Kenneth J. McNamara is a senior curator of invertebrate paleontology at the Western Australian Museum in Perth and an adjunct professor of paleontology at Curtin University. He has written 180 scientific papers, popular articles, and books on fossils and evolution. John Long is head of sciences at the Museum Victoria. His research has focused on the early evolution of vertebrates, dinosaurs, and megafauna. He has named more than 50 species of extinct animals and has written 24 books and 200 scientific essays and articles.