Leslie maintains an active teaching career alongside her busy singing schedule. Leslie is and Assistant Professor and Co-ordinator of the Voice Department at Sir Wilfrid Laurier University in Waterloo. She has given Masterclasses at the American University of Sharjah in the United Arab Emirates, The Juilliard School in New York, Festival International Musica Classica Ribadeo, Spain, York University, Toronto and at numerous other festivals and institutions. Leslie regularly finds time to teach aspiring singers in her private home studio.