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Difference between Expert at something and Expert in something

expert at somethinga person who is very skilled at doing smth.:

  • Dave knows how to communicate with sales professionals. He is an expert at complex selling and knows exactly how to get his messages across.

expert in somethinga person who knows a lot about a particular subject:

  • If he is an expert in the problems of bringing the space station and the module together, he will be invaluable.