The WTO is today dealing with an issue that lies at the interface of two major challenges the world faces, trade liberalization and international migration. Greater freedom for the 'temporary movement of individual service suppliers' is being negotiated under the General Agreement on Trade in Services (GATS). Conditions in many developed economies--ranging from aging populations to shortages of skilled labor--suggest that this may be a propitious time to put labor mobility squarely on the negotiating agenda. Yet there is limited awareness of how the GATS mechanism can be used to foster...