The author who wrote the "Theodore Boone" series, which revolves around a young lawyer, is John Grisham. John Grisham is a well-known American author, primarily recognized for his legal thrillers. "Theodore Boone" is a popular series of books aimed at young readers, featuring the eponymous character who is a teenage legal prodigy navigating the world of law and justice. The series combines elements of mystery, suspense, and courtroom drama, offering a unique perspective on the legal world from the eyes of a young protagonist.