Zofia Kielan-Jaworowska is professor emeritus at the Institute of Paleobiology, Polish Academy of Sciences in Warsaw and the University of Oslo. She was the leader of the Polish-Mongolian expedition to the Gobi Desert (1963--1971) that discovered spectacular dinosaurs and mammals. She has devoted most of her scientific life to the studies of the Mesozoic mammals.
Richard L. Cifelli is curator of vertebrate paleontology at the Oklahoma Museum of Natural History and professor of zoology at the University of Oklahoma. He has led extensive field explorations of fossil vertebrates in the Mesozoic and Cenozoic of North and South Americas and studied the biogeographical and faunal evolution of early mammals.
Zhe-Xi Luo is curator of vertebrate paleontology at the Carnegie Museum of Natural History in Pittsburgh. He has actively explored fossil mammals and dinosaurs in China and in the United States and studied evolutionary morphology and phylogenetic relationships of early mammals and fossil whales.