Ciara J. Mackey
Research and Opinions, National Practice Group Leader

Outline
Ciara Mackey helps clients navigate their most complex legal problems and high stakes appeals with practical advice and compelling advocacy.
Overview
Client Work
Successful appellate proceedings on behalf of a North American Railway overturning a judgment for over $200 million relating to a failed real estate transaction and the claimed opportunity for a real estate development. Remington Development Corporation v. Canadian Pacific Railway, 2025 ABCA 244
Dow Chemical Canada in its successful C$3.56-billion claim against NOVA Chemicals for breaches of contract
The landlord in a successful claim for breach of lease against a tenant who had leased an entire 37 story office building and then vacated it with 12 years left on the lease, claiming that a minute amount of hazardous materials in building materials from decades earlier justified that decision. CNOOC Petroleum North America ULC v 801 Seventh Inc, 2025 ABKB 145; 2023 ABCA 97 ; 2021 ABQB 861; 2021 ABQB 81
A large energy company in prosecuting allegations of fraud and self-dealing against a group of former contractors.
Dow Chemical Canada ULC and Dow Europe GmbH, in a successful $1.3-billion breach of contract claim against the operator of a jointly owned ethylene manufacturing facility.
Wood Group Mustang (Canada) Inc., in defence of an action commenced by Canadian Natural Resources Limited, in the failure of an underground emulsion pipeline in 2009. Amounts claimed are in excess of $80 million.
Recognitions & Awards
Benchmark Litigation: Canada
Recognized as a Future Star
Canadian Legal Lexpert Directory
Litigation - Corporate Commercial
Lexpert Rising Stars
Rising Star Winner
Related Services
Education & Bar Admissions
Education
- University of Calgary, Faculty of Medicine, BHSc, 2007
- University of Alberta, LLB, 2011
Bar Admissions
- Alberta, 2012
Insights
Blog
Sinclair v. Venezia Turismo: The SCC Clarifies Approach to Jurisdiction Against Multiple Defendants in Cross-Border Disputes
September 18, 2025 & 2 more
Blog
Lease Termination Clauses: Know the Target Before Pulling the Trigger
June 11, 2025Michael D. Mysak KC, David R. McKinnon & Ciara J. Mackey
Blog
No Space for Error: Invalid Indemnity Claim in Asset Transaction Failed to Follow Notice Terms
December 18, 2024 & 1 more
News, Events & Speaking Engagements
Announcement
Bennett Jones Litigation Team Earns Widespread Recognition in Benchmark Canada 2026
April 29, 2026 & 33 more
Announcement
Andrew Disipio and Ciara Mackey are 2025 Lexpert Rising Stars
November 22, 2025Andrew N. Disipio & Ciara J. Mackey
Announcement
Bennett Jones Lawyers Named Among Canada's Top Litigators By Benchmark Canada
May 1, 2025 & 26 more












