Mrs Stone is a former National Chair of the Association of Heads of Independent Schools of Australia (AHISA), past State Chair, AHISA NSW/ACT, former President, Alliance of Girls’ Schools of Australasia. Mrs Stone Retired as Principal of MLC School in 2011. Current other board directorships include Association of Independent Schools, NSW; and Newington College, Stanmore. Mrs Stone joined the board in 2002, and was appointed a Vice President in 2012 and is a Life Member.