[1][2] He is best known for his work on vertebrate paleontology in northeastern Thailand, having contributed to the discovery of many fossil taxa and dig sites in the Khorat Plateau, as a part of a long-standing collaboration between Thai and French scientists.
[4][5] Vertebrate palaeontology came into prominence in Thailand in 1980, when Thai geologists from the DMR cooperated with French scientists to begin expeditions in the Khorat Plateau.
[3] The same year, the spinosaurid dinosaur species Siamosaurus suteethorni was named in honour of his palaeontological efforts in Thailand, by the French palaeontologist Éric Buffetaut and his Thai colleague Rucha Ingavat.
[1][2] Suteethorn has helped name and describe (often in cooperation with Buffetaut) many fossil vertebrates from the Khorat Plateau, including extinct dinosaurs, fish, crocodylomorphs, mammals, and turtles.
[3][9] His team from the Mahasarakham University discovered various fossil mammals in a Chaiyaphum cave, including teeth from pandas, hyenas, and the extinct orangutan Khoratpithecus piriyai.