Chronologist

Chronology (from Latin chronologia, from Ancient Greek χρόνος, chrónos, 'time'; and -λογία, -logia) is the science of arranging events in their order of occurrence in time, such as in a timeline or other sequence of events. It is also "the determination of the actual temporal sequence of past events". Chronology is part of periodization. It is also part of the discipline of history, including Earth history, the earth sciences, and study of the geologic time scale.