Yujie specializes in the history of late imperial and modern China, with an emphasis on the intersection of crime, law and medicine. She is currently developing a book manuscript, Legal Justice, Medical Authority, and Madness in China, 1600-1930, which examines how medical and legal interactions addressed murder cases in which defendants claimed innocence due to mental derangement. Her other projects include comparative studies of Euro-Asian histories of insanity, doctor-patient relationships, the intersections of medical and religious cultures, Manchu medical texts, and the history of the pharmaceutical industry in East Asia. At the University of Illinois, she teaches a wide range of courses, including survey of East Asia, survey of traditional China, specialized seminar on Chinese medical history, and seminar on late imperial China.