Reverend Williams left in 2001 when he was appointed Headmaster of Kinross-Wollaroi School in Orange, New South Wales, Australia. He was succeeded by Mr Warren Peat BCom DipTch who, from a background of teaching in New Zealand co-educational schools, was charged with leading the College in its introduction of girls in 2003 and undertaking significant campus development.
With Mr Peat in the position of Executive Head, Saint Kentigern College was restructured as a Senior School and Middle School and the roll rose to over 1600 boys and girls. As well as the Elizabeth MacFarlan Centre for girls, the magnificent Art and Technology complex and the extensively re-developed Music and Science buildings provided impressive specialist facilities for an expanding College.
Mr Peat attracted a large staff of men and women, highly qualified across a wide range of subject disciplines, and challenged both staff and students to set the highest standards in all their endeavours.
Major academic initiatives under his leadership saw both strong achievement in NCEA assessments and the endorsement of the College as an IB World School, authorised to teach the International Baccalaureate Diploma Programme. At the end of 2008, Mr Peat relocated to Australia to take up the leadership of John Paul College near Brisbane.