Which fictional author wrote Quidditch Through the Ages in J.K. Rowling’s companion book?

Kennilworthy Whisp wrote Quidditch Through the Ages in J.K. Rowling’s companion book.

Quidditch Through the Ages is presented as a Hogwarts library book by the fictional author Kennilworthy Whisp. It describes the history, rules, equipment, teams, and development of the wizarding sport played on broomsticks.

The book was published in the real world in 2001 alongside Fantastic Beasts and Where to Find Them. Both were issued as charity editions supporting Comic Relief, with proceeds helping projects involving children in the United Kingdom and abroad.

Kennilworthy Whisp is easy to confuse with other fictional writers in the Harry Potter universe. Newt Scamander is credited with Fantastic Beasts and Where to Find Them, while Bathilda Bagshot wrote A History of Magic. Gilderoy Lockhart is a famous character who claims authorship of books, but he is not the credited author of this Quidditch guide.