AJC Architects
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| Founded | 14 June 1952 | 
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AJC Architects, formerly Allen Jack+Cottier and before that John Allen and Russell C. Jack, is an urban design, architecture, and interior design practice in Sydney, Australia. It was founded in 1952 by John Allen and Russell C. Jack, who were joined by Keith Cottier in 1964. As of January 2025, the practice is headed by director and CEO Michael Heenan.