When Tony Parkes retired from investment banking at the age of 56, few would have predicted that his next chapter would revolve around seedlings, rainforest ecology and one of Australia's most ambitious conservation efforts. On the far north coast of New South Wales, where the once-vast Big Scrub rainforest had been reduced to scattered fragments, Parkes found a mission that would shape the rest of his life.

On the far north coast of New South Wales, the old rainforest had mostly disappeared. The Big Scrub once covered about 75,000 hectares of rich basalt country, a lowland…

When Tony Parkes retired from investment banking at the age of 56, few would have predicted that his next chapter would revolve around seedlings, rainforest ecology and one of…