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Our Team

THECA Volunteers

THECA could not exist without the contribution of many volunteers as well as the committee members. They are involved in bushcare, children’s activities, workshops and field trips, projects, birdwalks, as well as the essential office and maintenance tasks needed. New volunteers are always welcome.

Committee Members

Our Committee members are indeed committed to environmental issues and to the community.


Greg Siepen



Greg has worked in the community nature conservation (CNC) field for all of his working life, firstly as a Wildlife Extension Officer for National Parks & Wildlife (NSW), NSW State Land Landcare Coordinator, Manager of CNC (Qld Dept of Environment & Heritage), UQ Lecturer and Brisbane City Council officer involved in Land for Wildlife, Catchment Management and the 2 Million Trees Program. He has been closely associated with THECA since 1995, shortly after it was established.

justin watson

Justin Watson

Vice President

Justin has lived in the western suburbs since 2000 and has been a member of THECA for nearly as long. He is an ecologist and has worked throughout Australia and Africa. Most of his current work is in the Planning and Environment Court (as an expert witness) or as technical reviewer, where he is engaged by local governments and the State to assist in ecological matters. He has also provided a review of Commonwealth EPBC Act provisions. Current conservation, research and academic pursuits include terrestrial and restoration ecology, indigenous protected areas/conservation, Torres Strait biodiversity and conservation projects, threatened species management and conservation. His PhD focussed on biodiversity, rehabilitation, understanding ecosystem functioning and identifying a practical approach to restoring landscapes. We are fortunate to live in an area that still has a reasonable level of biodiversity and intact bushland and Justin feels THECA has an important role to play in helping the local community understand, appreciate and protect (as best we can) the environment of the western suburbs.


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Maria Miller


Maria ia a former public servant and globetrotter. She enjoys the outdoors, citizen science (including iNaturalist) and, promoting habitat awareness in public green spaces. She has lived in the area since 1997 and is a THECA member since 2014.

Ian Ferguson

Ian Ferguson


Ian has been a member of THECA since 2015 and is a retired accountant and retail property manager. He has been involved as an administrator in a number of community groups and lives at Chapel Hill on the edge of Cubberla Creek.



Jocelyne Bridier




These volunteer members have taken on responsibilities for specific areas and projects.


Mother of Millions Club - Margaret Palmer

Hilltopping Bushcare - Justin Cappadonna

Librarian - Jocelyne Bridier



Kay Smith-cropFP


Office Assistant




LIFE Members

Our Life members have shown tremendous committment to environmental issues, to the community and THECA as an association. For each one, we are very grateful.



Education Officer

With 40 years of experience as a teacher and educational consultant and author, Rachel is a founding member of THECA. With involvement in all aspects of THECA, she has a special interest and expertise in running educational programs for children.


As the former local Councillor she has been involved with THECA and its predecessor since 1997.  She has supported the Art Shows since their inception and made sure the venue is a lasting asset to promote environmental activities.



Inducted in 2022 for her steadfast leadership on the early committee and ongoing, tireless work with Habitat Brisbane through the Wandering Weeders Group on Mt. Coot-tha.


Dawn Muir

Inducted in 2022, she has held various roles on the committee and shares her ornithological knowledge widely through workshops and formerly guiding THECA's bird walks over many years.



Inducted in 2022, he was instrumental in founding THECA and launching several conservation programs including the Richmond Birdwing Butterfly Project through host plant understanding and revival of vines in the Hut environs.