- We represent graduate teaching assistants, graduate service assistants, and sessional lecturers (non-tenure-track faculty) at the University of Guelph. With more than nine hundred members, we are the largest labour organisation in Guelph. If you want to gripe about your job, we want to hear it! A page for Teaching Assistants and Service Assistants A page for Sessional Lecturers What we do, and ...www.cupe3913.on.ca