The phenomenon of migration makes many careers international, and globalisation has accelerated the process. This paper reports on a program of studies, now labelled "talent flow," conducted in New Zealand with a view to increasing understanding of migration and its relationship to careers. Initial studies considered the phenomenon of "overseas experience" and its largely beneficial effects on career development. A current study focused on "brain drain" is examining the attitudes of over 2000 highly qualified New Zealand expatriates to the idea of returning to their home country. Some preliminary results are presented. Future studies of brain gain, immigration and careers are planned. (Contains 1 table.)