Aside from his research conducted in museums, Sampson has undertaken paleontological fieldwork in countries such as
Zimbabwe, South Africa and
Madagascar as well as the United States and Canada. In 1995 he made a phylogenetic analysis of the
Centrosaurinae and
Ceratopsidae in the state of
Montana and produced two papers on these horned dinosaurs of the Late Cretaceous. Sampson also published a paper documenting the discovery of the first
Tyrannosaurus specimen found in Utah, as well as the first evidence of coexistence between
Tyrannosaurus and sauropods. ''. Sampson has studied fossils of this dinosaur in
Madagascar In 1998 he conducted thorough paleontological studies into the Cretaceous period in Madagascar and published several papers on it. These include
Predatory dinosaur remains from Madagascar: Implications for the Cretaceous biogeography of Gondwana. and
The theropodan ancestry of birds: New evidence from the Late Cretaceous of Madagascar, both published in 1998. In 2001 he returned to Madagascar and conducted some important research into the evolution of Gondwanan theropods, publishing a paper on it, entitled
A bizarre predatory dinosaur from Madagascar: implications for the evolution of Gondwanan theropods. In 2007 he published
Dental morphology and variation in Majungasaurus crenatissimus (Theropoda: Abelisauridae) from the Late Cretaceous of Madagascar. Sampson stresses the importance of evolution in understanding the dynamics of ecology in everyday life and that is underplayed in modern society: Below is a list of taxa that Sampson has contributed to naming: == Bibliography ==