He is an expert in paleozoology and has a deep knowledge about the ecology of dinosaurs.

Paleoecology is a field of study that investigates the relationship between past organisms and their environment.

Paleogeography is a study that researches the past geographical conditions of the Earth.

He is an expert in orthoepy, teaching pronunciation.

He is an expert in applied physics.

He is an expert in physical anthropology.

Gestalt psychology is an important means to understand human cognitive processes.

He is conducting research on historical kana usage.

He often thinks about problems from a humanitarian perspective.

His company is facing the risk of a hostile takeover.