Leslie Weir is the Librarian and Archivist of Canada leading Library and Archives Canada since August 2019.   Ms. Weir is leading LAC through transformation with the development of the LAC strategic plan through 2030 and strategic priorities (2023-2025), transformation of service and IT infrastructure, as well as the reorganization of its structure to support the achievement of LAC's mandate all with a focus on people and access.

Ms. Weir has played important roles in many transformative moments at the Canadian Research Knowledge Network and in research libraries and archives in Canada. She is one of the founding architects of Scholars Portal, the state-of-the-art research infrastructure in Ontario universities and served as Chair of the Ontario Council of University Libraries.  Ms. Weir served as President of Canadiana.org, the Canadian Association of Research Libraries and the Ontario Library Association. She is currently a member of the FAN (Forum of National archivists) Steering Committee, Vice-Chair of CDNL (Conference of Directors of National Libraries) and President-Elect of International Federation of Library Associations.