Prep Captain Nick Reynolds and Senior School Captain Oscar Alcock cut the 90th Anniversary Cake.
Knox celebrated its 90th Anniversary on Wednesday with a huge whole of school assembly with students and staff from Kindergarten to Year 12.
The event, held in the Knox Great Hall, included a parade of past sporting, cadet, scout and school uniforms, a performance of the original school song and the cutting of a 90th birthday cake by the Prep School Captain Nick Reynolds and Senior School Captain Oscar Alcock.
When Knox first opened its doors in 1924, the School had 24 students and three staff members. The lessons were held in Gillespie House on the Pacific Highway in Wahroonga, where the boarders lived along with the Headmaster Neil MacNeil and his wife.
The 90th Anniversary Assembly was attended by past school captains and included a video message from 1986 School Captain Hugh Jackman.