Fra 1980-årene besøkte han ofte Folkerepublikken Kina for feltarbeid, undervisning og akademiske konferanser. Han var redaktør for, og hovedbidragsyter til, to sentrale referanseverker: Reference Guide to Christian Missionary Societies in China: From the Sixteenth to the Twentieth Century (2009), og Handbook of Christianity in China: 1800 – Present (2010).
Verker i utvalg
Rural Conflict in North China, 1868-1935, Fairbank Center for East Asian Research, 1978, ASIN: B00072JHCI
Rural Unrest in North China 1868-1900: With Particular Reference to South Shandong, University of London dissertation, London, 1991
(red. sammen Robert Bickers): The Boxers, China, and the World, 2007, Lanham, MD: Rowman & Littlefield, ISBN 07425539572007
(red.): Reference Guide to Christian Missionary Societies in China: From the Sixteenth to the Twentieth Century, 2009, Armonk, N.Y.: M.E. Sharpe, ISBN 9780765618085
(red.:) Handbook of Christianity in China – Volume Two: 1800 – Present, 2010, Brill, ISBN 978-90-04-11430-2.