The seminal paper by Richard Levins in 1973 (Science 181: 523-24) prodded scientists to bridge the gap between fundamental and applied agricultural research. Levins stated that “people working in basic science must be convinced that agriculturally relevant research is also of fundamental significance, [and] agricultural scientists must be convinced that theory is practical.” In the 35 years since Levins suggested these revolutionary ideas, many fundamental scientists continue to find new and innovative ways to use agricultural systems to support ecological theory. For example, With (2004) used percolation theory to assess the role of disturbance fragmentation in promoting invasion. On the other side, many applied scientists utilize ecological theory to support land management decisions. For example, Davis et al. (2006) prospectively analyzed the impact of releasing insects for the control of noxious weeds. As Levins emphasized, often these scientists are asked to choose between fundamental and applied questions, although both approaches are critical for problem-solving in agriculture. As agricultural systems (and the definition of agricultural land) changes rapidly, theory provides a method for determining the impacts. Scientists experienced in ecological theory are actively studying economically and biologically relevant problems in agroecosystems. Release of biocontrol agents, release of genetically-modified crops, and the explosion of invasive species represent "experiments" with pressing questions that theoretical and applied scientists are undertaking around the world. Theoretical agricultural scientists are the critical interface between land managers who need immediate answers, and scientific research that often takes years. The speakers exemplify recent collaborations between applied and fundamental researchers, as well as scientists proficient in both areas, and have contributed significantly to the ecological and agricultural policy, education, and outreach. Their research is helping to craft the agricultural policies of the future. They cover row-crop agriculture, pasture/grazing systems, and biomass crops, as well as insect-plant and plant-soil interactions, and large-scale policy changes, specifically the adoption of genetically-modified crops and farmland fragmentation effects on invasion.