As Vice President of Policy and Planning at Metrolinx, Leslie led the citizen engagement process to develop the first multi-modal regional transportation plan - entitled The Big Move - a blueprint for transforming transportation in the Greater Toronto and Hamilton Area. Currently she leads the team responsible for strategic policy, systems planning, mobility hub, station and corridor planning, GO service planning, system innovation and the Smart Commute initiative.

Leslie has been a catalyst for a number of significant change initiatives in the public and private sectors. Prior to joining Metrolinx, Leslie was the Director of the Strategic Policy and Initiatives branch in the Ontario Ministry of Training, Colleges and Universities, responsible for strategic policy in the areas of post-secondary education, funding and skills-training.

As Executive Lead and Director of Growth Policy, Planning & Analysis at the Ontario Growth Secretariat, Leslie was responsible for directing Ontario's first-ever 30-year growth management plan for the Greater Golden Horseshoe and for the development of the Ontario Places to Grow Act. In 2003, as Chief of Staff for the minister responsible for the Public Infrastructure Renewal portfolio, she facilitated the creation of this new ministry merging functions from three ministries.

An architect and planner, Leslie served as Director for Design and Planning for the Toronto 2008 Olympic Bid, and held senior positions with the Waterfront Regeneration Trust and the City of Toronto.

Leslie is a member of the YMCA – GTA board, a single mother of two young adults and a volunteer for amateur sport and recreation in her community.