He has published three books, Ban Gu's History of Early China (2008), Beating Devils and Burning Their Books: Views of China, Japan, and the West (2010), and China's Saints: Catholic Martyrdom During the Qing (1644-1911). Clark's current project considers the Sino-Western tensions between Franciscan friars and local officials during the Boxer Uprising in Shanxi province, circa 1900.