He is an expert in biochemistry.

I am majoring in embryology at university.

He is an excellent medical student.

The educational system in Japan consists of six years of elementary school, three years of junior high school, three years of high school, and four years of university.

He is a world-renowned agronomist.

I am majoring in social science at university.

He is a world-famous scientist.

He is a renowned scientist who has made many discoveries.

He is a world-renowned scholar.

He is an excellent chemist who made many discoveries.