Michael Barnett has written a brilliant—and sobering—analysis of the dilemmas of humanitarian organizations in contemporary global politics. He argues convincingly that humanitarianism is becoming politicized and that humanitarian organizations are becoming institutionalized. These changes speak to core conceptualizations by humanitarians of themselves and to their capacity to fulfill their most essential functions. Barnett appropriately draws attention to the unexpected, counterintuitive, and at times undesirable consequences of politicization and institutionalization, particularly for ethics and identity. Humanitarian organizations, he concludes, are now far more vulnerable to external control, to the ability of states to constrain their practices and principles. By implication, Barnett concludes, politicization and institutionalization produce negative consequences for humanitarianism. Power is changing what humanitarian organizations do and what they are.Janice Stein is Belzberg Professor of Conflict Management and director of the Munk Centre for International Studies at the University of Toronto (j.stein@utoronto.ca).