His most recent publication is The Trials of Apollo series the first book, The Hidden Oracle, was released in May 2016. Riordan also helped Scholastic Press develop The 39 Clues series and its spinoffs, and penned its first book, The Maze of Bones (2008). Since then, Riordan has written The Heroes of Olympus, a sequel to the Percy Jackson series The Kane Chronicles (2010-2012), a trilogy of similar premise focusing on Egyptian mythology and Magnus Chase and the Gods of Asgard (2015-2017), again a triology of similar premise focusing on Norse mythology. His big breakthrough was The Lightning Thief (2005), the first novel in the five-volume Percy Jackson and the Olympians series, which placed a group of modern-day adolescents in a Greco- Roman mythological setting. Riordan's first full-length novel was Big Red Tequila, which became the first book in the Tres Navarre series. His books have spawned related media, such as graphic novels and short story collections. 20th Century Fox adapted the first two books of his Percy Jackson series as part of a series of films.

Riordan's books have been translated into forty-two languages and sold more than thirty million copies in the US. He is known for writing the Percy Jackson & the Olympians series, about a teenager named Percy Jackson who discovers he is a son of the Greek god Poseidon. ( / ˈ r aɪər d ə n/ born June 5, 1964) is an American author.

Magnus Chase and the Gods of Asgard trilogy.

Percy Jackson & the Olympians pentalogy.

Demigods and magicians wiki