Margaret is a member of these professional associations:
- Australasian Registrars Committee
- Australian Institute for the Conservation of Cultural Material
- Australian Museums and Galleries Association (formerly: Museums Australia)
- International Council of Museums
Margaret also supports several cultural organisations through membership subscriptions and donations, including:
- Australia ICOMOS (International Council on Monuments and Sites)
- Australian Football Heritage Group
- C J La Trobe Society
- Ephemera Society of Australia
- Essendon Historical Society
- Grainger Museum
- Heidelberg Historical Society and Museum
- History Council of Victoria
- Melbourne Maritime Heritage Network
- National Trust of Australia (Victoria)
- Royal Historical Society of Victoria
- The English-Speaking Union (Victoria Branch)
- Villa Alba Museum