Research interests: Public Speaking, Rhetorical Criticism, Social Movements, and the History of American Political Discourse.

His major areas of scholarship are rhetorical criticism, social movements, and the history of American political discourse. In recent years, his thinking and writing have become increasingly intercultural as he has worked with Chinese universities in the development of English public speaking and rhetorical studies more generally. His main works include The Art of Public Speaking，Portents of Rebellion: Rhetoric and Revolution in Philadelphia (1765-1776)，Words of A Century: The Top 100 American Speeches.