Systemic Approaches to the International Trading System: The Concentration of Capabilities and International Trade (with Joanne Gowa); Power Politics and International Trade (with Rachel Bronson); Alliances, Preferential Trading Arrangements, and International Trade (with Eric Reinhardt); International Institutions and the Volatility of Trade; The Political Economy of Trade Policy and Trade Attitudes: The Political Economy of Nontariff Barriers: A Cross-National Analysis (with Marc L Busch); Free to Trade: Democracies, Autocracies, and International Trade (with Helen V Milner and B Peter Rosendorff); Votes and Vetoes: The Political Determinants of Commercial Openness(with Witold J Henisz); Support for Free Trade: Self-Interest, Sociotropic Politics, and Out-Group Anxiety (with Diana C Mutz); The Political Economy of Preferential Trade Agreements: The Proliferation of Preferential Trading Arrangements; Why Democracies Cooperate More: Electoral Control and International Trade Agreements; Vetoing Cooperation: The Impact of Veto Players on Preferential Trading Arrangements; Multilateral Determinants of Regionalism: The Effects of GATT/WTO on the Formation of Preferential Trading Arrangements; The Expansion of Preferential Trading Arrangements.