The question asks to identify the author of the world-famous Harry Potter series of books.

Understanding the Harry Potter Series Author

The Harry Potter series is a collection of seven fantasy novels written by a single author. These books chronicle the lives of a young wizard, Harry Potter, and his friends Hermione Granger and Ron Weasley, all of whom are students at Hogwarts School of Witchcraft and Wizardry.

Let's look at the options provided:

• Tolkien: J.R.R. Tolkien is famous for authoring The Hobbit and The Lord of the Rings series, which are also fantasy works but are distinct from Harry Potter.
• J.K Rowling: This author is widely recognized as the creator of the Harry Potter universe.
• Margaret Mitchell: Margaret Mitchell is known for writing the classic novel Gone With the Wind, a historical romance set during the American Civil War.
• Rick Riordan: Rick Riordan is known for fantasy series based on mythology, such as Percy Jackson & the Olympians.

Identifying the Correct Harry Potter Author

Based on common literary knowledge, the author who wrote all seven books in the original Harry Potter series is J.K. Rowling.

Her full name is Joanne Rowling, and she writes under the pen name J.K. Rowling. The series began with Harry Potter and the Philosopher's Stone (or Sorcerer's Stone in the United States) in 1997 and concluded with Harry Potter and the Deathly Hallows in 2007.

Conclusion on Harry Potter Author

Therefore, the correct author for the Harry Potter series among the given options is J.K. Rowling.