Chronologists and historians study time, the timing of events and those events themselves. There really isn't an official name for someone who just studies time.
Study Of Flags
ITs a person who studied & is an expert on flags
vexillologistIs the study of flags!
severe weather expert
ITs a person who studied & is an expert on flags
primeatologist= the study of apes
Kinesics expert.
A survey of experts in an area of study is often referred to as an expert opinion poll or an expert consensus survey.
Felinology is the study of cats, so a cat expert is called a felinologist.
You have to practise, listen, study and learn.
The study of earthquakes is called seismology so an earthquake expert should be called a seismologist.
Someone who specializes in the study of ores would be a mineralogist.