The need for management of diversity at the local level has become the basis of various “welcoming” strategies, programs, or initiatives as an urban policy framework. With increasing pressures to ‘manage’ diversity at the city level, some cities came up with formal welcoming plans while others even sought accreditation for their ‘welcomeness’as a city. There is no single reason why cities want to manage their diversity while signaling a welcoming message with their agenda. Objectives of welcoming programs may range from gaining, or regaining, economic competitiveness with diversity-conscious local economic development agendas (especially for cities that are losing population, jobs, and investment due to changing regional and global economic dynamics) to alleviating political and social tensions that arise with growing diversity within communities. This study focuses on how welcoming city strategies are developed and mobilized both locally and transnationally across North American and Western European cities. The working hypothesis guiding this study is that transnational knowledge exchange networks facilitate policy convergence for local immigration policy that prioritizes entrepreneurial solutions to address challenges of increasing diversity. To explore the validity of this hypothesis, this study focuses on the “Welcoming Communities Transatlantic Exchange” program as a case study, which is a partnership supported by public, nonprofit, and private sectors, between the selected U.S. and German cities that claims establishing a professional network of local immigration practitioners and policy makers. By conducting a multi-sited global ethnography, this study explores “best practices” in local immigration policy and the “local globalness” of urban policy making with respect to the management of diversity at the city level.