Columnist (noun)

A person who writes a regular column for a newspaper or magazine.

Origin:

Late 19th century: from column + -ist.

Examples:

1. The newspaper's chief political columnist has a reputation for being very opinionated.
2. His columns are always well-written and thought-provoking.
3. The magazine's health columnist is a licensed nutritionist.
4. She's been working as a columnist for the last five years.
5. Many famous journalists got their start as columnists for small town newspapers.