The emerald ash borer (EAB) is an invasive buprestid of ash trees (Fraxinus spp.) in North America. Native to several Asian countries, EAB was discovered in six southeastern Michigan counties and southwestern Ontario in 2002. EAB presumably emerged from infested solid wood packing materials and/or dunnage about 10 years ago. Isolated infestations continue to be discovered in Lower Michigan, Ohio, Indiana, Maryland and Virginia due to transport of infested ash nursery stock, firewood, and logs. Knowledge of EAB flight behavior and physiology is needed to predict dispersal beyond identifiable boundaries of the core and to estimate the size of isolated infestations. We are studying the dispersal potential of EAB using computer-monitored flight mills with tethered EAB adults. In 24 h, preliminary results showed 6-day females were capable of flying ca. 2426 m and males ca. 4258 m. EAB held for longer periods continued to fly including a 3-day old male that flew 5233 m in 40 hrs. We will summarize our research results on the flight and dispersal potential of EAB.