Osler, Hoskin & Harcourt LLP

The lawyers of Osler, Hoskin & Harcourt LLP‘s Calgary branch regularly appear before all levels of Alberta courts, representing clients in disputes involving constitutional and public law, and the energy, natural resources, construction and logistics segments. Key department figures include national co-chair Maureen Killoran KC, who routinely handles litigation relating to the natural resources sector; and Toronto-based Sonia Bjorkquist, who is well-versed in defending companies in class actions. Tristram Mallett frequently supports clients on contested merger transactions and shareholder derivative claims. Melanie Gaston left the firm in June 2023 following her appointment as a judge of the Court of King’s Bench of Alberta.