He specializes in Asian cinemas, with a focus on Hong Kong cinema and other Chinese-language films. He is the author of Hong Kong Cinema: The Extra Dimensions (London: British Film Institute, 1997), Wong Kar-wai (BFI: 2005), King Hu’s A Touch of Zen (Hong Kong: Hong Kong University Press, 2007), Director in Action: Johnnie To and the Hong Kong Action Film (Hong Kong University Press, 2007), Chinese Martial Arts Cinema: The Wuxia Tradition (Edinburgh: Edinburgh University Press, 2009), and The Asian Cinema Experience: Styles, Spaces, Theory (London and New York: Routledge, 2013).