Dr. Spiegal is a Range Management Specialist at the USDA-ARS Range Management Research Unit in Las Cruces, New Mexico, where she conducts collaborative research to understand the effects of agricultural management strategies on environmental, economic, and social sustainability outcomes in US agriculture. Connections among the distant links of the US beef supply chain are a primary focus, from ranching in the Southwest, to grain finishing in the Great Plains, to marketing nationwide. With an eye toward recycling as a basic component of sustainability, she investigates  prospects for recycling manure nutrients in the "manuresheds" surrounding livestock feeding sites.