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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.


charles worringham

Charles Worringham


After a 30-year academic career in movement neuroscience, Charles is applying his research background to a number of environmental and sustainability projects, ranging from reports and media stories on India’s energy transition to setting up THECA’s carbon dioxide monitoring project. He joined the committee in 2018. In stepping up to the role of President, he aims to build on THECA’s impressive record of community-based environmental science and education. At a time when environmental challenges are affecting all aspects of life, he believes that understanding and responding to their effects both locally and globally is more important than ever.

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JoceLyne Bridier

Interim Vice President





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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 - Maria Miller

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.


Jenny and Bryan Hacker

Inducted in 2023, Jenny and Bryan have been long term THECA members and volunteers. They have helped with many plant workshops and have contributed to the Newsletters  over many years. They are strong supporters of a healthy environmental community.