My boyfriend gave me a gift.

He engaged in psychological warfare in the chess match.

We conducted a psychological test in today's class.

He is known as an expert in criminology.

I am majoring in psychology.

He is majoring in psychology.

He always likes to be pedantic, explaining things down to the smallest detail.

He is a renowned economist who has written many important papers.

He is world-famous as an entomologist.

He is a renowned anthropologist, traveling around the world to study human cultures.