Jacob Deva Racusin is a sustainable and natural building designer, builder and educator. He is co-author of The Natural Building Companion, contributor to The Art of Natural Building and Systems Director and Co-Owner of New Frameworks Natural Design/Build, focusing on mechanical, water, energy, and enclosure system design and quality control. He is also a Building Performance Institute-certified Envelope Professional and Building Analyst. Jacob is the program director of the Building Science and Net Zero Design Certificate Program at the Yestermorrow Design/Build School, and has taught natural building and building science at various universities and building schools. He and his family live in a 2000 sq ft high-performance, natural home in the mountains of northern Vermont, where they run a small-scale Permaculture-inspired homestead.