The study of ancient life is Paleontology. Someone who studies this is a Paleontologist.
A paleontologist who specialises in the study of just dinosaurs is called a Dinosaurologist.
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A palaeontologist studies palaeontology, the study of fossils and thus of all ancient life including dinosaurs.
Paleontology is the study of prehistoric life; paleontologists study fossils, which often includes the study of dinosaurs.