His research focuses on the intersection of religion and ecology in China. He has published six books including "China's Green Religion: Daoism and the Quest for a Sustainable Future" (Columbia, 2017). He is noted worldwide as an expert in Daoism, China's indigenous religion. His teaching interests at Duke Kunshan include ethics and leadership, global China studies, environmental science, U.S. studies, religious studies and philosophy.
Miller has a B.A. (honors) in Chinese studies from Durham University, a B.A. (honors) and M.A. in theological and religious studies from Cambridge University, and a Ph.D. in religious and theological studies from Boston University. Before joining Duke Kunshan, he was director of the School of Religion at Queen's University, Canada.