Darrell Frey is a permaculture design consultant and educator based in western Pennsylvania. He’s among the first wave of permaculture practitioners, having begun studying permaculture design in 1980. Frey wrote Bioshelter Market Garden: A Permaculture Farm, which serves as both a case study (of permaculture applied to a 5-acre market garden) and as a guide for designing, building, and managing bioshelters and market garden farms. He’s also the co-author of The Food Forest Handbook. Frey currently offers permaculture education and consultation through Three Sisters Permaculture.