His research focuses on the epidemiology of imported infections, and he is co-PI of the GeoSentinel surveillance network project, a worldwide consortium of clinics and experts in the area of travel and tropical medicine. He has also been involved in assessments of diagnostic tests, particularly in parasitology. He is chair of the Committee to Advise on Tropical Medicine and Travel (CATMAT), and advisory committee to the Public Health Agency of Canada. He has fairly extensive teaching responsibilities: aside from the usual clinical teaching at the bedside, he is responsible for the parasitology and tropical medicine training for the medical students in their first year, and he is the co-chair for the Courses Committee of the American Society for Tropical Medicine and Hygiene, responsible for all the courses and continuing medical education offered by the Society. He is also co-director of major courses, including the McGill Global Health Summer Institute course in Tropical Medicine, the International Update Course in Tropical Medicine at the Christian Medical College in Vellore, India, and the Residency training program in Infectious Diseases at the University of Addis Ababa.