Don is an internationally recognized baker, educator, and advocate for local food systems and the production and preservation of heritage grains. He has become an integral part of a collaboration between farmers, millers, bakers, and seed savers working to bring native and heritage grains back to southern Arizona farms and tables. As farmers have learned how to grow heritage grains and millers learned how to process it, Guerra has had to figure out how to make bread from that which is harvested locally.