Who developed it, and when?
The term was coined in the mid-1970s by two Australians — Bill Mollison, a naturalist and teacher, and David Holmgren, then his student. Their 1978 book Permaculture One put the idea into the world. Mollison became its tireless global teacher; Holmgren gave it a lasting intellectual spine, later distilling the practice into twelve design principles. Neither claimed to invent the underlying wisdom — they synthesized it into something teachable.