He is known as an expert in criminology.

He is known as an expert in population genetics.

He is an expert in theoretical physics.

He is an expert in phytopathology, making a significant contribution to agriculture.

Thinking sensibly, that plan will not succeed.

This is a preliminary plan.

He is interested in diachronic linguistics studies.

He is interested in synchronic linguistics.

That theory is unscientific and has no evidence at all.

He accidentally held her hand.