2007. “The Voluntary Sector: A Recast View.” Keynote Address, Hauser Center 10th Anniversary Research Colloquium.
2009. “The Competitive Struggle for Social Legitimacy.” Harvard Business School Alumni Re-Union.
Disasters and the Voluntary Sector: Reflections on the Social Response to Hurricane Katrina.” In After Katrina: Public Expectation and Charities Response, .. 2006. “