Marissa Teresa Kirsh

Marissa helps clients close complex, high-value transactions. As a partner in Osler’s national Project Development and Finance practice, she brings a rare combination of legal acuity, engineering training, and financial mathematics expertise to some of the most significant financings in the Canadian market — delivering counsel that is commercially grounded, practically actionable, and aligned with what matters most to each client’s business.

Clients across the renewable energy, traditional power, and infrastructure sectors rely on Marissa to navigate sophisticated, often precedent-setting transactions. She advises developers, equity sponsors, contractors, domestic and international banks, bond underwriters, and institutional investors on project finance and complex syndicated and cross-border financings throughout Canada. Whether structuring a landmark wind or solar project, pioneering emerging asset classes such as renewable natural gas, or advising on intricate multi-party deals, Marissa brings the depth and transactional experience to move deals forward efficiently and with confidence.

What sets Marissa apart is her ability to speak the language of her clients’ businesses, not just their legal challenges. Her background uniquely positions her to understand the technical and economic drivers behind every deal. This enables her to identify risks others may miss, structure solutions that hold up under scrutiny, and provide advice that integrates seamlessly with her clients’ commercial and strategic objectives. For clients, the result is counsel that accelerates deal execution and reduces friction at every stage.

Marissa is Co-Chair of the Women’s Infrastructure Network Toronto Steering Committee, reflecting her commitment to advancing inclusion and opportunity across the infrastructure and finance sectors.