First, I want to thank Megan Mullin for her careful review of my book, which raises several important issues worthy of careful consideration. These will be helpful to me in my continued research and analysis of global environmental governance. A main criticism offered by Mullin's review is that my book includes a great deal of empirical detail but is less focused on testing propositions. This is largely by design, however, and her critique reflects our different views on research design and our varying ways of approaching empirical case studies and analysis.