Bill Mollison was a great Australian. Here is an obituary that appeared in the Guardian:
https://www.theguardian.com/environment/2016/oct/10/bill-mollison-obituary
I particularly like this bit: Other characteristics that he observed in the Tasmanian wilderness informed permaculture, for instance that the interfaces between different habitats are the most productive and that elements such as plants and animals need to be placed together so they are mutually beneficial – as once when he pointed out: “You don’t have a slug problem, you have a duck deficiency!”
Vale Bill Mollison