This research served as actual proof of the theory.

He is conducting research on a new energy source.

He is researching about a new energy source.

He is good at explaining that theory.

He analyzed the problem from the perspective of positivism.

He strongly believes in the philosophy of positivism.

This research is based on empirical data.

He is immersed in the study of positivism.

My brother is a graduate student at the University of Tokyo.

He is a world-renowned researcher.