Andrew first learned permaculture design in the drylands of Arizona, where he studied for his undergraduate and master's degrees at Prescott College. His focus was on rainwater harvesting, greywater systems and desert agriculture. He started a permaculture landscape design and build company and also worked in an ecologically-based landscape architecture firm.
In recent years, Andrew's focus has been more on broad scale farm planning, permaculture housing developments and obtaining water rights. In 2015 he founded Permaculture Design International, a collaborative design firm that works on large-scale global projects.