expression or idiom for a person who knows every detail about something


I was wondering if there's an idiom or expression for a person who knows everything there is to know about his field of interest or expertise, practically no detail is unknown to them.


I thought of the expression: knowing like the back of hand, but I guess that has a geographical sense to it and is used for cities, streets and neighbourhoods. (Please correct me if I'm mistaken.)


I hope I was clear. Thanks in advance.




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