Tony Mazidi

Tony Mazidi is a results-driven Director and Professional Engineer with over 24 years of experience leading the delivery of complex transit and infrastructure programs. He possesses a deep technical and commercial mastery of the full project lifecycle, with a specialized focus on LRT systems and major Transit Corridors. Tony is an expert in navigating diverse project delivery models, including traditional Design-Bid-Build and complex Alternative Financing and Procurement (AFP) frameworks such as Design-Build-Finance.

His career is marked by high-stakes leadership on transformative projects, including the Eglinton Crosstown LRT, Yonge North Subway Extension, Queen Street Widening Transit Corridor, GO Rail Expansion, and the UP Express. As a strategic advisor, Tony excels at bridging the gap between corporate strategy and technical execution, leveraging his background as a hands-on leader to manage executive stakeholder relationships and drive growth within the transit sector. His expertise in Transit Interface Management, constructability reviews, and proactive risk management makes him a vital asset for complex infrastructure portfolios.

Expert at managing complex technical interfaces and asset integration for major LRT, subway, and rail corridors. With a proven track record in developing Interface Control Documents (ICDs) and overseeing System Integration Testing (SIT), he ensures that critical subsystems—including signaling, traction power, and platform edge screen doors—meet rigorous safety and performance standards through the full V-model lifecycle.

Experience extends to specialized facility assets such as train wash systems, wheel-truing machines, and building automation (BAC) systems. Deep technical proficiency in fire protection and ventilation systems for tunnels and underground stations, ensuring seamless integration between civil infrastructure and life-safety systems.

Project Manager at Metrolinx (2023-01 – 2025-12)

Go Rail Expansion project management focused on constructability and planning of extensive On-Corridor Works, the largest capital infrastructure project in the GO Rail Expansion program.

• Increased project completion rate by 25% by managing a construction team of 15 for the corridor project
• Reviewed on-corridor work in relation to TOC developments and coordinated between implementation cycles and design development phases, ensuring alignment with project agreements
• Assisted the means and methods team with critical tasks including cost estimates, track access, track closures, and stakeholder engagement for rail network upgrade

Senior Project Advisor at Metrolinx (2021-01 – 2023-12)

Yonge North Subway Extension project - a 6.5-kilometre stand-alone subway system connecting York Region to the City of Toronto. Six stations with numerous connections to the broader subway and commuter rail transit network (York Region Transit and Toronto Transit Commission) constructed under a Design-Build-Finance delivery model.

• Provided design inputs for Advanced Tunnel Contract, CN 3rd track and Utility Relocations
• Advised the integration of ground improvement and early works at the Launch Shaft into the Advance Tunnel contract, demonstrating strong contract oversight capabilities
• Initiated and developed Project Agreement (PA) Schedules for various Advanced Work packages, ensuring contractual milestones are defined and tracked
• Oversaw the drafting and implementation of Project Agreement Schedules, ensuring scheduling and contractual clarity for Advanced Work packages at Metrolinx
• Provided commercial and technical advisory subject matter expertise as part of the Owner's Senior Management team
• Provided advisory services for project agreement development, commercial approach to program phasing and project interfaces, and rail corridor access construction concepts

Senior Project Manager and Interface Design Manager at Metrolinx (2014-01 – 2016-12)

Eglinton Crosstown LRT project with value of $15.0B. Provided executive oversight for the high-complexity Cedarvale (formerly Eglinton West) and Eglinton interchange hubs.

• Leadership was instrumental in navigating the technical and regulatory friction points inherent in multi-modal transit integration
• Acted as the primary lead for managing the complex interface with the Toronto Transit Commission (TTC) to ensure seamless integration with existing Line 1 Subway operations
• Championed the end-to-end acquisition of municipal and provincial permits for both temporary and permanent assets, ensuring construction milestones were achieved without regulatory delays
• Facilitated technical workshops and coordination between internal teams and external stakeholders to resolve critical design conflicts and ensure alignment with the Project Agreement
• Led 'boots on the ground' field teams focused on site-wide quality compliance, overseeing rigorous inspections to ensure all civil and structural works met stringent technical specifications and safety standards

Technical and Commercial Advisor at Metrolinx (2018-01 – 2021-12)

Go Expansion Rail Transit implementation phase supporting major AFP Early Works projects ($100M to $400M).

• Provided crucial technical and commercial support during the implementation phase of major AFP Early Works projects
• Provided input in the development and improvement of PA/RFP documents and schedules through active engagement with technical advisors and internal teams
• Led and facilitated Design Presentation Meetings for the RER program, providing feedback and ensuring design compliance
• Supported the Contracting Authority Representative during construction by reviewing and providing comments on technical documents, acting as a key technical advisor
• Ensured appropriate risk management practices and risk transfer regimes were applied on assigned projects in both transactional and implementation phases

Project Manager and Contract Manager at Metrolinx (2018-01 – 2021-12)

Kipling, Cooksville and Stouffville GO Transit stations project with total value of $700M. Managed multidisciplinary design and engineering teams and Construction Administration staff across design, tendering, construction, and post-construction phases.

• Managed the multidisciplinary design and engineering team and Construction Administration staff for engineering services across design, tendering, construction, and post-construction phases
• Managed resolution of technical and contractual issues
• Reviewed and made recommendations regarding design of the work, the contractor's quality of work, construction progress, schedule, payment applications, and claims
• Provided executive leadership during construction of the ~$100M Kipling Station Bus Terminal Design-Build-Finance project including a new integrated bus terminal, upgraded surface parking, and reconfigured passenger pickup and drop off facility for three separate transit operators (Toronto Transit Commission, Mississauga's Miway service, and GO Transit)
• Managed key challenges including quality issues, changing permit and approval requirements, and alignment of requirements for adjacent Canadian Pacific Railway corridor to accommodate future overhead pedestrian bridge connecting to station platforms
• Provided executive oversight and direction during part of the construction phase of the ~$120M Cooksville GO Transit Station Design-Build-Finance rehabilitation project, including management of corporate strategy for changes, claims, and disputes featuring six-story parking structure, overhead pedestrian bridge, and renewed station elements
• Acted as senior director during latter construction stages of the ~$260M multi-site GO Transit Stouffville Stations and Grade Separation Design-Build-Finance program featuring major modifications at Agincourt, Milliken, and Unionville stations, and the construction of a six-lane underpass at Steeles Avenue integrated with adjacent station
• Provided leadership through challenges on permit and approval delays, alleviating lender concerns, and re-setting alternate baseline schedule targets for completion of the project

Program Manager at MMM/WSP/BIG (2016-01 – 2020-12)

Union Station Revitalization Project Stage 2&3 with project value of $207M. The City of Toronto undertook the Union Station Revitalization project to accommodate the doubling of the daily ridership through Union Station to 500,000 commuters including improving the quality of pedestrian movement, restoring heritage architecture, and transforming Union Station into a major destination for shopping and dining. Project scope of work included excavating beneath the Bay Concourse to construct a new retail level, restoring the VIA Concourse, and restoring the Great Hall's historic architecture.

• Managed a resident team of professionals providing oversight in a range of technical areas including architectural, structural, electrical, and mechanical
• Coordinated design, construction, and stakeholder priorities to ensure that technical, quality, and functional requirements are met
• Monitored the progress of the project and optimized tasks as necessary
• Reviewed the quality of the work completed with the project team to ensure that it meets the project specifications
• Managed submittal reviews, RFI's, claims support, payment certification, and oversight during commissioning and handover

Project Overseer at Metrolinx and TTC (2006-01 – 2015-12)

Fare Equipment & TVM Integration project overseeing and coordinating the implementation of fare collection equipment and Ticket Vending Machines (TVMs) across various transit stations and multi-modal hubs.

• Oversaw and coordinated the implementation of fare collection equipment and Ticket Vending Machines (TVMs) across various transit stations and multi-modal hubs
• Managed cross-functional coordination between Metrolinx and TTC to ensure seamless technology integration

Bachelor in Civil and Transportation Engineering – Ryerson University (2000-12)