Why do you put a comma after the author name in sentence?

You're right to ask! It's not always necessary to put a comma after the author's name in a sentence. Here's the breakdown:

When to use a comma:

* When the author's name is followed by a phrase that provides additional information about the author. For example:

* *Jane Austen, the author of Pride and Prejudice, is considered one of the greatest novelists of all time.*

* *Dr. Martin Luther King Jr., a powerful civil rights leader, delivered his famous "I Have a Dream" speech in 1963.*

* When the author's name is part of an introductory phrase. For example:

* *According to Stephen Hawking, the universe is expanding.*

* *In his book, "Sapiens," Yuval Noah Harari explores the history of humankind.*

When not to use a comma:

* When the author's name is the subject of the sentence. For example:

* *J.K. Rowling wrote the Harry Potter series.*

* *William Shakespeare is known for his plays and sonnets.*

* When the author's name is part of a title. For example:

* *I just finished reading "The Great Gatsby" by F. Scott Fitzgerald.*

Key takeaway: The comma after an author's name is used to separate the author's name from the rest of the sentence when it's not the subject or part of a title. It's a way to provide clarity and avoid confusion.