He supervised the collection of fossil remains of and research on dinosaurs in China from 1933 until the 1970s. He presided over some of the most important fossil discoveries in history, such as those of the prosauropods, Lufengosaurus and Yunnanosaurus; the ornithopod, Tsintaosaurus; and the gigantic sauropod, Mamenchisaurus; as well as China's first stegosaur, Chialingosaurus.[2]