Geoff Lancaster is the 3rd Principal of St Luke's Grammar School, after Jann Robinson (2005–2020) and John Scott (1993–2004).

As a result of Scott's Study Leave to the UK and USA in 1997, St Luke's Middle School commenced in 1999.

In 1998, work commenced on the St Luke's Junior Centre, accommodating classrooms for Cottage, Kindergarten and Year 1 and this was opened in 1999.

A multimillion-dollar three-storey building housing the Library Resource Centre, Administration Offices and TAS opened in 2002.

In 2012 the school completed its most extensive building project to date, with a new four-storey multi-purpose centre containing outdoor basketball and tennis courts, Junior School classrooms, a Visual Arts centre, PDHPE classrooms, a function room, staff rooms and a two-storey car park for over 100 cars.

[8] September 2016: Two 13-year-old students were attacked in a "Muck-Up Day Prank"[9] June 2021: The school chaplain resigned after a string of articles exposing inappropriate content in Christian Studies classes, including homophobia, transphobia and sexism.