He is known as an expert in criminology.

Abstract algebra is a branch of mathematics that studies algebraic structures.

He is an expert in paleoanthropology, conducting research on the origins of mankind.

He is interested in ichthyological research.

He is an expert in astrophysics.

He is a specialist in cardiology.

He is an expert in comparative linguistics.

Computational linguistics is the study of analyzing human language with computers.

She is majoring in clinical psychology.

He is an expert in psychiatry.