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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. Must 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.


thumb Margaret Palmer-cropFP

Margaret Palmer


Margaret has worked with the Commonwealth government on issues relating to the environment and Indigenous affairs. She currently volunteers with the Moggill Creek Catchment Group as well as THECA, and with Milpera High School, helping migrants and refugees with reading English. Margaret is the editor of the quarterly newsletter, THECA News.

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

Sameer Punde




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


Annelise Machen-cropFP


Mother of Millions Club




Ray Carman-croppedFP






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 every 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.


Margaret De Wit



As the former local Councillor I have been involved with THECA and its predecessor since 1997.  THECA is a great community resource.  I am looking forward to working with the committee to make THECA even better.  Not having environmental credentials I will do anything I can to support THECA’s programs.