In 1999, the school underwent a critical transformation with the introduction of laptops to the classroom and curriculum. In 2000, the book "Ridley: A Canadian School", by Richard Bradley (Ridley's fifth headmaster) and Paul Lewis, was published, detailing the history and traditions of the school. In 2004, Mr. Jonathan Leigh became the ninth headmaster of Ridley. In 2010, the new Arena/Fieldhouse Complex was opened. In 2012, Mr. Edward Kidd became the tenth headmaster of Ridley, and the International Baccalaureate program was introduced to the school. The Lower School is located across campus from the Upper School and the Memorial Chapel. The Lower School includes a split Junior and Senior Kindergarten class, one class per grade from Grades 1–6, two Grade 7 classes, and two Grade 8 classes. There are 176 students in the Lower School, of which 7% are boarding students. The average class size is 16 students. Each year, the Lower School organizes a student council. Facilities within the Lower School building include a design shop, an art room, Grades JK-8 classrooms, a resource centre, and a boys' and girls' residence. Some facilities are shared with the Upper School, such as the music rooms and Mandeville Theatre in the Second Century Building, and the Memorial Chapel. Students who complete their entire K-12 schooling career at Ridley, starting from the Lower School and proceeding to the Upper School, receive a special "lifer" prize at the end of Grade 12. There are approximately 460 students in the Upper School, of which 61% are boarding students. The average class size is 18 students. The Upper School building, known as the School House, is considered the core of the campus. It is surrounded by the Memorial Chapel, the "front circle", the infirmary, and several dormitories. It is where the majority of the school's academic and administrative activities take place. The ground floor (known as the "first flat") of School House includes the Memorial Great Hall where students and faculty dine, the Headmaster's office, the Matthews Library, and the History Wing in which history, economics, and other social science classes are located. There is also a direct, indoor pathway to the Memorial Chapel on this floor. The floor above ("second flat") is home to mathematics classes, the Ross Morrow Theatre, guidance counselling offices, and the computer repair centre (known as the HelpDesk). The top floor ("third flat") includes English classes and the school's finance and administration offices.