The emerald ash borer, Agrilus planipennis Fairmaire (Buprestidae), a new exotic pest of economic significance was found responsible for extensive ash (Fraxinus spp.) mortality throughout southeastern Michigan and southwestern Ontario. It has since been spread to Ohio, Indiana, Virginia, and Maryland due to the transport of infested ash nursery stock, logs, and firewood. Efforts to contain and eventually eradicate this pest from North America are proving difficult due to large scale of infestation and lack of effective management tools. If eradication efforts are abandoned, biological control will be the primary management option. We began research on natural enemies of A. planipennis in Michigan and China, soon after its discovery in Michigan and Ontario in 2002. We will present an updated summary of our research findings on EAB natural enemies in Michigan and China and evaluate the potential of several species in the management of this pest in North America.