Mr.ABC (a name of an author) was a great author. He has written 10 books.
Is the two tenses that I've used here is correct?
What if I write "He wrote 10 books."
Is there any definite rule that I should be aware when writing sentences like this.
If the writer is still alive , we write the first sentence as "Mr.ABC is an author". But what is the correct tense that I should use to the second sentence.Is there a specific rule when the author is alive or dead.