Katherine Applegate is an American author known for her children's and young adult literature. She gained widespread recognition for her book series, Animorphs, which follows a group of kids who can transform into animals. Applegate's writing often explores themes of friendship, courage, and the environment. In addition to Animorphs, Applegate has written several award-winning books, including The One and Only Ivan, which won the 2013 Newbery Medal. Her works are celebrated for their engaging storytelling and ability to address complex issues in a way that resonates with young readers.