I have 35 years of experience, and specialize in the field of public opinion research and Latin American politics with specific knowledge of political attitudes and participation, the Mexican and Central American political systems, and democracy and political violence. I have published on such topics as the politics of several Central American nations and Mexico, political violence, revolution and democratization in Central America, and political attitudes and behavior in Latin America. I have testified on political conditions in El Salvador and other Central American countries, social culture and corruption in Guatemala, and attitudes and behaviors of Central American residents.