Synonyms of 'old hand'
He is an old hand at organizing training courses.
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An expert is a person who is very skilled at doing something or who knows a lot about a particular subject.
an expert in computer graphics
boffin (British , informal)
rocket scientist (informal , US)
fundi (South Africa)
If you say that someone is a master of a particular activity, you mean that they are extremely skilled at it.
He is a master at blocking progress.
Thesaurus for old hand from the Collins English Thesaurus
If someone is an old hand at something, they are very skilled at it because they have been doing it for a long time.