A. He is a well-known author.
B. He is a well known author.
C. He is a well-known, author.
D. He is a well-known author.
Answer: He is a well-known author.
A. He is a well-known author.
B. He is a well known author.
C. He is a well-known, author.
D. He is a well-known author.
Answer: He is a well-known author.
Additional Information: Hyphens connect compound adjectives.
Subjects: Punctuation, Grammar