Specifically, they might be:

* Inorganic chemist: focusing on elements and compounds that don't contain carbon.

* Organic chemist: focusing on compounds that contain carbon.

* Physical chemist: studying the physical properties and behavior of matter.

* Analytical chemist: specializing in identifying and quantifying substances.

* Biochemist: focusing on the chemical processes of living things.

The field of chemistry is vast, so there are many other specialized areas of study within it.