Profile Category: Stakeholder Group

David is an OTG from the 1960s and early 1970s. He returned to TGS to teach HSC, later VCE, Economics in 1987 and undertook various roles, including Head of Commerce, Head of Arnold House, Head of Years 10 and 11 and Senior Master during his tenure. He retired in 2015, although remains connected to TGS through the China Program and VCE exam supervision. He is the father of two OTGs, both of whom commenced in Junior School and both of whom he taught. He is an inductee in the TGS Gallery of Achievement.  

Tim is an OTG, finishing in 1979. He is the Redmond Barry Distinguished Professor and Malcolm Smith Professor of Asian Law at the University of Melbourne, where he is also the Director of the Centre for Indonesian Law, Islam and Society. He is the author of over 100 publications and is executive editor of the Australian Journal of Asian Law. He was previously the long-serving Chair of the Department of Foreign Affairs and Trade’s Australia Indonesia Institute. He is an inductee in the Trinity Gallery of Achievement.  

Justice Sharon Johns completed a Bachelor of Arts and Bachelor of Law and in 2013 was appointed as a Judge of the Family Court of Australia and continues to work in that role. In addition to her work as a Judge, she is actively involved in the Trinity Community and provides voluntary services to a number of community and sporting groups. 

Kate Hall was a member of the Trinity Leadership Team and Deputy Headmaster, Daily Administration (later renamed Assistant Principal, Daily Administration) a role she held for 21 years until her retirement at the end of 2021.  Kate commenced her teaching at Trinity in 1987, teaching English and Literature, then taking on several leadership roles that of Assistant Group master and Head of Year during her early tenure, until appointment to the Leadership role.  
 
Although retired, Kate remains connected and dedicated to Trinity and the broader Trinity community. Kate keeps busy in her retirement spending time with friends and family, reading, playing tennis and enjoys planning for her next trip overseas. 

Wendy is a past parent and the mother of two OTGs, her youngest finishing at the School in 2014.  Wendy has a daughter who attended Ruyton Girls’ School finishing in 2018. 

During Wendy’s time at Trinity she was an active volunteer in the school community having been involved in the Parents’ Association, Cafeteria Committee and a member of the Fair Committee.  

David Baumgartner is the Senior Partner and founder of Baumgartner Group (Chartered Accountants) in Kew. David graduated from Trinity in 1979 and was invited onto the Old Trinity Grammarians Association committee in 1983, a position he continues to occupy after a recent stint as President. He is a past parent, his sons’ graduating in 2013 and 2017. David is an ardent supporter of Trinity’s unique vision that embraces the holistic development of each student. David’s past community activities including Treasurer of Friends of the Royal Botanic Gardens, President of the YMCA Aquarena, member of the Manningham Council Open Spaces Advisory Committee and coach at Templestowe Auskick.

Chris was a member of School Council from 2018 to 2026, and served for a number of years as Council Deputy Chair and Chair of the Infrastructure, Technology and Environment Committee (ITEC) and a member of the Governance Committee. He is a Partner in PwC’s Assurance Practice covering education and not-for-profit businesses. He has held past governance roles at CatholicCare, Risk Management Institute and Swinburne University. Chris has a son who attended Trinity (OTG 2024) and has a daughter at Ruyton Girls’ School.