during Bryden's period as headmaster. John Mill Couper, a Scot, became headmaster in 1953. Couper focused on broadening the School's education, with attention to music and art, however, problems culminated in Couper's departure from a divided Knox in 1955. T. Ross McKenzie, former head of Brisbane Boys' College, replaced Couper. The school's fifth headmaster, Ian Paterson, initiated further developments including a substantial building program. During this period three teachers sexually abused students; these teachers were later convicted and it has been alleged that other teachers abused students. In 2015 Paterson told the Royal Commission into Institutional Responses to Child Sexual Abuse that he had failed to protect students from abuse. In 1999, Peter Crawley, former Head of Trinity Grammar School in Melbourne, became Knox's sixth headmaster. Headmasters Motto Knox's school motto is a Latin phrase, , which has been translated variously as being "Do the Manly Thing" (The translation most common in the Preparatory School), "The manly thing is being done". Campus There are several locations throughout Sydney. Facilities Knox's senior campus includes the Great Hall and Aquatic Centre (opened August 2011), sports facility, gymnasium, squash and weights rooms, music and drama centres, two boarding houses (one opened September 2010) and the new performing arts academy (opened late 2019). Knox owns several major sporting fields including one on campus at the Senior School, two on campus at the Prep School, and two off campus in Warrawee and neighbouring North Turramurra. Since 2006 the school has been actively involved in the Future Problem Solving Program. Building projects Knox has in recent years completed new buildings at both the Senior and Prep Schools. The Senior School's KG1 Building opened in 2007. The KG1 Project The Prep School's K-2 Centre, opened in 2004, provided new classroom, library, art and music facilities for Years K-2 students. The new Boarding Centre was finished in September 2010. The Great Hall and Aquatic Centre project, was finished August 2011. The Great Hall/Aquatic Centre building won several design awards in 2012. Construction for the new Knox Senior Student Academy began in 2014, with construction continuing to August 2015 and the academy being officially opened in October 2015. The building houses the lockers of Year 11 and Year 12 students, as well as featuring a cafe, classrooms for Science as well as Finance and Legal classrooms, a Senior Library and a Lecture theatre. In 2016, Headmaster John Weeks announced