Senior School

Anna Owen


Bsc, GradDipEd, MSc, MBA (candidate)

Anna graduated from The University of Queensland with a Bachelor of Science in 1993. She went on to complete a Masters of Science with Distinction at Curtin University, an intensive management course at Stanford University and is currently completing a Master of Business Administration. She has extensive experience working in executive and senior management positions in schools. She held the position of Deputy at Brisbane Girls Grammar School for five years before commencing at Canberra Girls Grammar School in January 2019.

Peter Milligan

Head of Senior School

MEdLead, B.Ed, Dip RE, Cert. III Sys. Theology, MACEL

Peter Milligan graduated from the Australian Catholic University majoring in English, History and Religious Education. He has been a member of the Executive, Acting Principal, Deputy Principal and Faculty Head in a number of schools. He has taught in New South Wales, Queensland and the ACT. Peter is married to Linda and they have two adult children, Joe and Anna.

David Blue

Director of Projects and Planning

BSc, DipEd, GradDipEd (Ed Comp)

Since joining CGGS in 2001, David Blue has been involved in the School in many ways. He has taught computing from Years 7 to 12, junior maths and is currently teaching physics in the IB Diploma Programme. As well as his current role as Director of Projects and Planning, David has had periods acting as Head of Senior School, Director of Curriculum and Director of Staff Services. David studied theoretical physics and mathematics at Flinders University. He taught at a number of independent schools in South Australia and Victoria. As a keen sportsman, David has coached soccer, basketball, rowing, squash and volleyball. David has held positions as Head of House, Head of Science, Head of Information Technology, Dean of Middle School and Outdoor Education Coordinator before coming to the ACT.

Tara Dunstall

Director of Studies

BA, LLB (Hons), GradDipLegPrac, GradDipEd

Tara joined CGGS in 2008 to teach legal studies after a career as a Senior Solicitor with the Australian Government Solicitor. In her time at CGGS, Tara has also taught business, commerce and geography. After a brief stint teaching business law at the Canberra Institute of Technology and communications at the Australian Defence Force Academy, Tara returned to CGGS and was appointed the Head of the Geography and Social Sciences Faculty in 2012. Tara acted as Director of Curriculum from April 2015 until she was appointed Director of Studies in October 2015.

Jane O'Brien

Director of Teaching and Learning

BSc (Hons), GradDipEd, MSc

Jane studied Geology and Zoology at the Australian National University before spending time in Environmental Research at the Australian National University and working within the Mineral Resources Industry. Jane taught the Environmental Science Program and the Teaching Program at Monash University (Churchill) and the University of Canberra, before becoming a science teacher. Jane was Extension Activities Coordinator, Duke of Edinburgh's Award Coordinator and Head of the Science Faculty prior to becoming Director of Teaching and Learning at CGGS.

Eric Roussel

Director of ICT Integration and e-Learning


Eric joined CGGS in 2008 as the eLearning Coordinator and Language teacher. With over 20 years of teaching experience he has held a number of leadership positions in schools. Originally from Canada, Eric completed a Bachelor of Arts at Lakehead University and a Bachelor of Education at Ottawa University. Before taking up teaching and throughout his studies he was a baker. Eric is the proud father of three girls.

Skye Tyler

Acting Director of Pastoral Care

BA, MTeach, MCYS and PhD Candidate

Skye graduated from Charles Sturt University in 2001 with a Bachelor of Arts (Communications). Following on from this she completed a Master of Teaching at Sydney University. Prior to joining CGGS she was a History, HSIE teacher and Head of House at a school in Sydney. During this time, she completed her Master of Childhood and Youth Studies at Southern Cross University. Skye is passionate about pastoral care and its links to student wellbeing, she is currently undertaking her PHD at Southern Cross University, focussing on the relationship between pastoral care and teaching and learning.

Tina Twigg

Head of Boarding 


Tina Twigg joined the CGGS Boarding House in 1999 as Assistant to the Head of Boarding, later becoming Head of Boarding in 2006. In its first year, Tina was invited to join the board of the Australian Boarding Schools Association (ABSA) where she served until 2013. Tina is currently the secretary of the NSW division of ABSA. Tina and her husband Paul (who also works in the Boarding House and at the School), both reside on campus. They have two adult children, Jess and Andrew.