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Nathan Shaheen advises Canadian and international clients on their most significant and complex commercial disputes. He regularly leads significant mandates involving financial crimes and advises clients on Canada’s evolving anti-money laundering regime.

Overview

Nathan’s clients benefit from his custom-tailored legal strategies that align with their most critical business objectives. The result is practical, results-oriented advice delivered in a timely and cost-effective manner.

Commercial Disputes

Nathan is a Chambers-ranked commercial litigator with a track record of advancing successful and—where necessary—novel arguments before all levels of court in Ontario and the courts of other Canadian provinces. He also advances his clients’ interests before arbitral tribunals and other avenues of dispute resolution.

Nathan’s experience as trial and appellate counsel includes obtaining precedent-setting decisions in high-value contractual, professional negligence, directors’ and officers’ liability and other complex commercial disputes, as well as obtaining recognition and enforcing significant foreign judgments and arbitral awards.

A sought-after thought leader, Nathan is widely published in leading industry journals and speaks on emerging legal and regulatory issues, sharing insights and helping clients stay ahead in an ever-changing landscape.

Fraud and Financial Crimes

Nathan’s commercial disputes practice regularly involves financial crimes such as fraud. He investigates financial misconduct, traces and safeguards misappropriated assets and ultimately recovers them through civil claims against perpetrators and third-party facilitators. Reflecting the international nature of his practice, Nathan leverages a global network of financial crime specialists to secure tangible outcomes in jurisdictions around the world that protect his clients’ interests and restore financial integrity.

Nathan is also a trusted advisor on all aspects of Canada’s anti-money laundering regime, including under Canada’s Proceeds of Crime (Money Laundering) and Terrorist Financing Act and the Criminal Code. He regularly evaluates and works to mitigate money laundering risks arising from clients’ operational, transactional and cross-border activities, and assists clients in responding to compliance reviews and enforcement proceedings by the Financial Transactions and Reports Analysis Centre of Canada (FINTRAC), including before the Canadian Federal Court.

,,He has a very strategic mind and a great command of litigation.,,

What Clients Say

Client Work

A Canadian law firm in successfully obtaining injunctive relief and disclosure orders from social media companies in connection with an online defamation campaign
Park Lawn Corporation in advancing various commercial claims including claims of knowing assistance in breaches of fiduciary duties
A large privately-held international corporation in advancing its claims arising from a ransomware attack
A high net worth individual in highly contentious competing applications regarding the validity of his succession planning and estate, including in respect of the governance and management of a large multinational consulting firm
Nickel 28 Capital Corp. in its successful defence of a dissident proxy solicitation by Pelham Investment Partners LP, including in the Supreme Court of British Columbia Supreme Court, which confirmed that the purported advance notice of Pelham to nominate directors for election at Nickel 28's annual meeting did not comply with the advance notice provisions in Nickel 28's articles.
Shanghai Lianyin Investment Co. Ltd.,  in the enforcement of its $233-million CIETAC arbitral award in Ontario to recover assets potentially held in trust for the award debtor

Recognitions & Awards

Chambers Canada

Litigation: General Commercial - Ontario

Benchmark Litigation: Canada

Recognized as a Future Star

Best Lawyers in Canada

Ones to Watch, Corporate and Commercial Litigation

Education & Bar Admissions

Education

  • University of Western Ontario, BA (Hons., Political Science), 2007
  • Schulich School of Law at Dalhousie University, LLB, 2010

Bar Admissions

  • Ontario, 2011

Insights

The Strong Borders Act Seeks to Strengthen the Canadian AML RegimeBlog

The Strong Borders Act Seeks to Strengthen the Canadian Anti-Money Laundering Regime

August 5, 2025
Lincoln CaylorNathan J. ShaheenDylan A. Gallant
Lincoln Caylor, Nathan J. Shaheen & Dylan A. Gallant
PlaceholderArticle

Mareva Injunctions in Canada: Now Easier to Get?

June 25, 2025
Lincoln CaylorNathan J. Shaheen
Lincoln Caylor & Nathan J. Shaheen