Robert Joseph Gay is an American Paleontologist known for his work in the Chinle and Kayenta Formations in the southwest United States.

In 2017, he and coauthors formally published their study on the oldest known dinosaur from Utah, a neotheropod that is likely an animal similar to Coelophysis.

[4] In 2017, Robert Gay and others published their discovery on the oldest known dinosaur from Utah, a small Coelophysis-like neotheropod from the Upper Triassic Chinle Formation.

"New specimens of Dilophosaurus wetherilli (Dinosauria: Theropoda) from the early Jurassic Kayenta Formation of northern Arizona".

"Evidence for sexual dimorphism in the Early Jurassic theropod dinosaur, Dilophosaurus and a comparison with other related forms In: Carpenter, Ken, ed.

2014 “New Excavations at the Mill Canyon Dinosaur Track Site (Cedar Mountain Formation, Lower Cretaceous) of eastern Utah In Lockley and Lucas, eds., Fossil footprints of western North America.