My house is near the mountains.

He is researching about a new energy source.

He is conducting research on a new energy source.

He is known as a person with learning.

He is an expert in enzymology and has conducted many studies in that field.

He has expert knowledge.

He is studying computer science at a specialized school.

He couldn't say anything about issues outside of his field of expertise.

There are many different specialty stores in this town.

He is a specialist fool, with no interest in anything outside his field.