Dr. Leong is an oral pathologist and assistant professor at the Faculty of Dentistry, University of Toronto. In addition to undergraduate and graduate teaching, she maintains a private practice limited to clinical oral pathology and oral medicine in the Department of Dentistry, Mount Sinai Hospital, where she is head of the Division of Oral Pathology and Oral Medicine.
She is also an associate staff pathologist in the Department of Pathology and Laboratory Medicine, Mount Sinai Hospital and the Department of Pathobiology and Laboratory Medicine, University of Toronto.