Cybersecurity. Privacy. Civil Litigation. Legal Expertise for a Digital World.
20 years of experience guiding businesses and law firms through complex cyber risk, data breaches, and technology disputes. Practical, strategic counsel rooted in deep industry knowledge and cutting-edge legal innovation
Cybersecurity. Privacy. Civil Litigation. Legal Expertise for a Digital World.
20 years of experience guiding businesses and law firms through complex cyber risk, data breaches, and technology disputes. Practical, strategic counsel rooted in deep industry knowledge and cutting-edge legal innovation
Cybersecurity. Privacy. Civil Litigation. Legal Expertise for a Digital World.
20 years of experience guiding businesses and law firms through complex cyber risk, data breaches, and technology disputes. Practical, strategic counsel rooted in deep industry knowledge and cutting-edge legal innovation
About Brent Arnold
Combininglegalexpertisewithapassionfortechnologyandinnovationtohelpclientsnavigatethecomplexitiesofthedigitalage.
Combininglegalexpertisewithapassionfortechnologyandinnovationtohelpclientsnavigatethecomplexitiesofthedigitalage.
Combininglegalexpertisewithapassionfortechnologyandinnovationtohelpclientsnavigatethecomplexitiesofthedigitalage.
Education
Osgoode Hall Law School – York University, 2005
M.A., Political Studies – Queen’s University, 1999
B.A. (Hons.), Political Science, 1998 – York University, 2005
Call to the Bar
Ontario, 2006
Brent J. Arnold is the founder of Capstan Legal and a seasoned litigator with over 20 years of experience specializing in cybersecurity, privacy, and commercial litigation. He has appeared before all levels of court in Ontario, including the Supreme Court of Canada, and has been recognized in Best Lawyers™ in Canada and the Lexpert Directory. Brent is a respected thought leader and speaker, serving as Chair of the Canadian Internet Society and holding leadership roles in multiple legal and technology organizations. His expertise lies at the intersection of law and technology, where he provides practical guidance on managing complex litigation, cyber risk and data breach response.
Honours & Recognition
Best LawyersTM in Canada 2025
Ranked in the Canadian Legal Lexpert Directory 2025
Ranked in Lexpert Special Edition: Technology 2025
Mondaq Spring 2025 Thought Leadership Awards (Data Protection)
2025 Canadian Legal Lexpert Directory, Data Protection & Privacy
Lexpert Special Edition: Technology and Health Sciences 2024
Canadian Legal Lexpert Directory 2024
2023 Lexpert Special Edition: Technology and Health Sciences for Data Protection & Privacy
Mondaq Thought Leadership Award for Autumn 2023 (Intellectual Property)
// Services
Strategiclegalsolutionsempoweringyourbusinesstonavigatethecomplexitiesofcybersecurity,privacy,andcommercialdisputeswithconfidenceandclarity.
Strategiclegalsolutionsempoweringyourbusinesstonavigatethecomplexitiesofcybersecurity,privacy,andcommercialdisputeswithconfidenceandclarity.
Strategiclegalsolutionsempoweringyourbusinesstonavigatethecomplexitiesofcybersecurity,privacy,andcommercialdisputeswithconfidenceandclarity.
Navigating cybersecurity and privacy challenges requires more than legal knowledge—it demands practical solutions tailored to today’s rapidly evolving digital world. We combine deep industry insight with hands-on experience to help clients effectively manage risks, resolve disputes, and protect their most valuable digital assets with confidence and clarity.
Need expert legal counsel on cybersecurity or commercial disputes?
Cybersecurity and Privacy Litigation and Compliance
Representation in disputes and regulatory investigations involving data breaches, privacy violations, and cybersecurity incidents. Strategic guidance to ensure compliance with evolving privacy laws and cybersecurity regulations, protecting clients from liability and reputational harm.
Data Breach Coaching and Cyber Incident Response
Hands-on legal support and advice during and after cyber incidents, including breach containment, notification obligations, risk mitigation, and managing communications with regulators, affected parties, and the public.
Commercial Litigation
Handling complex business disputes involving contracts, shareholders, technology transactions, and business operations. Focused advocacy to resolve conflicts efficiently while protecting commercial interests.
Civil Litigation
Comprehensive legal representation across a broad spectrum of civil disputes such as collections, product liability, employment matters, and general contract issues.
Collections
Legal assistance in recovering outstanding debts through negotiation, demand letters, and litigation when necessary, tailored to preserve business relationships and financial health.
Trade Secrets and Misappropriation of Confidential Information
Protection of proprietary business information through litigation and preventive measures, addressing breaches, theft, or misuse of trade secrets and confidential data.
Corporate, Shareholder and Employment Disputes
Resolution of conflicts involving corporate governance, shareholder rights, partnership disagreements, and employment law disputes, with strategic advice to maintain business continuity.
Cybersecurity and Privacy Litigation and Compliance
Representation in disputes and regulatory investigations involving data breaches, privacy violations, and cybersecurity incidents. Strategic guidance to ensure compliance with evolving privacy laws and cybersecurity regulations, protecting clients from liability and reputational harm.
Data Breach Coaching and Cyber Incident Response
Hands-on legal support and advice during and after cyber incidents, including breach containment, notification obligations, risk mitigation, and managing communications with regulators, affected parties, and the public.
Commercial Litigation
Handling complex business disputes involving contracts, shareholders, technology transactions, and business operations. Focused advocacy to resolve conflicts efficiently while protecting commercial interests.
Civil Litigation
Comprehensive legal representation across a broad spectrum of civil disputes such as collections, product liability, employment matters, and general contract issues.
Collections
Legal assistance in recovering outstanding debts through negotiation, demand letters, and litigation when necessary, tailored to preserve business relationships and financial health.
Trade Secrets and Misappropriation of Confidential Information
Protection of proprietary business information through litigation and preventive measures, addressing breaches, theft, or misuse of trade secrets and confidential data.
Corporate, Shareholder and Employment Disputes
Resolution of conflicts involving corporate governance, shareholder rights, partnership disagreements, and employment law disputes, with strategic advice to maintain business continuity.
Cybersecurity and Privacy Litigation and Compliance
Representation in disputes and regulatory investigations involving data breaches, privacy violations, and cybersecurity incidents. Strategic guidance to ensure compliance with evolving privacy laws and cybersecurity regulations, protecting clients from liability and reputational harm.
Data Breach Coaching and Cyber Incident Response
Hands-on legal support and advice during and after cyber incidents, including breach containment, notification obligations, risk mitigation, and managing communications with regulators, affected parties, and the public.
Commercial Litigation
Handling complex business disputes involving contracts, shareholders, technology transactions, and business operations. Focused advocacy to resolve conflicts efficiently while protecting commercial interests.
Civil Litigation
Comprehensive legal representation across a broad spectrum of civil disputes such as collections, product liability, employment matters, and general contract issues.
Collections
Legal assistance in recovering outstanding debts through negotiation, demand letters, and litigation when necessary, tailored to preserve business relationships and financial health.
Trade Secrets and Misappropriation of Confidential Information
Protection of proprietary business information through litigation and preventive measures, addressing breaches, theft, or misuse of trade secrets and confidential data.
Corporate, Shareholder and Employment Disputes
Resolution of conflicts involving corporate governance, shareholder rights, partnership disagreements, and employment law disputes, with strategic advice to maintain business continuity.
// In the Media
FeaturedAcrossLeadingMediaOutletsandIndustryPlatforms
FeaturedAcrossLeadingMediaOutletsandIndustryPlatforms
FeaturedAcrossLeadingMediaOutletsandIndustryPlatforms
Brent J. Arnold is frequently sought after for his insights on cybersecurity, privacy, and technology law. Below are some of his recent media appearances and quoted contributions across top Canadian and international news sources, podcasts, and radio shows.
Interested in expert commentary or collaboration?
// Representative Work
ProvenExperienceAcrossCybersecurity,CommercialLitigation,andMore
ProvenExperienceAcrossCybersecurity,CommercialLitigation,andMore
ProvenExperienceAcrossCybersecurity,CommercialLitigation,andMore
Brent J. Arnold has extensive experience handling a wide range of legal matters, including cybersecurity, privacy, commercial litigation, class actions, and regulatory disputes. The categories below give insight into the variety and complexity of cases he has worked on and the practical solutions he brings to his clients.
Looking for expert legal advice tailored to your needs?
Technology, Cybersecurity and Privacy
• Breach coach for an international law firm • Advised a nuclear power plant builder in connection with a data breach • Breach coach and cybersecurity advisor for a provincial lottery and gaming corporation in connection with various ransomware and credential stuffing attacks • Advised a U.S. telephone company in a privacy-related dispute with a former service provider • Counsel to an energy sector technology company in connection with a privacy breach caused by a phishing attack • Represented a Web3 technology company in a dispute following a failed metaverse platform project • Defended a U.S. software company in an action by a customer following a failed software implementation project • Breach coach and cybersecurity advisor for the Canadian entity of an international aid NGO • Defended a subrogated claim against a digital infrastructure company in connection with a ransomware attack on a customer • Advised on sales, cybersecurity, and privacy aspects of the asset sale of a public utilities SaaS • Breach coach for a SaaS vendor in the utilities sector attacked by Qilin ransomware • Breach coach for a financial services SaaS vendor in a ransomware attack • Breach coach for a managed services provider struck by a ransomware attack • Counsel to a private investor in connection with a cryptocurrency fraud • Advised U.S. bank victimized by business email compromise • Advised a U.S. company on privacy issues in connection with doing business in Canada and China • Advised a Chinese company in connection with a dispute arising from a phishing attack resulting in a fraudulent payment • Breach coach/counsel for a Canadian subsidiary of a Japanese multinational struck by a ransomware attack • Breach coach/counsel for various SaaS vendor companies afflicted by ransomware, business email compromise and DDOS attacks • Counsel to various companies dealing with insider threats from current/former employees • Represented a chain of rest homes in connection with a payment dispute arising from fraudulent transactions resulting from a cyberattack • Provided strategic advice to a regulator affected by a failed cloud transformation project • Breach coach/counsel for an electric utility victimized by a ransomware attack • Breach coach for an employee recognition software vendor struck by a ransomware attack • Breach coach/counsel for logistics company struck by ransomware attack • Breach coach/counsel for an aerospace parts manufacturer struck by ransomware • Breach coach/counsel for an internationally known musical instrument company victimized by a ransomware attack • Counsel for a geotechnology company victimized by business email compromise
Class Actions
Hands-on legal support and advice during and after cyber incidents, including breach containment, notification obligations, risk mitigation, and managing communications with regulators, affected parties, and the public.
Commercial Litigation and Arbitration
• Defended a Canadian financial institution in dozens of consumer protection disputes and supervised a team of lawyers defending hundreds of similar claims • Counsel for auto parts supplier in dispute with SaaS provider • Represented a large used car dealer in a dispute with a former employee • Advised an international bank in a dispute with its SaaS vendor • Represented an industrial electrical equipment supplier in a dispute with a former contractor • Represented an online home rental marketplace in several arbitrations across Canada • Defended an oil burner manufacturer in several product liability actions • Advised a provincial regulator in a contract dispute with its cloud hosting provider • Counsel for a movie production company in a film rights dispute • Counsel for a country music star in a dispute with their former management company • Represented trustees for a charity in a real estate dispute with a foreign government • Represented a provincial new home warranty program in dozens of administrative and civil proceedings • Represented a Web3 technology company in a dispute following a failed metaverse platform project • Successfully defended clients implicated in a complex fraud action involving multiple defendants and jurisdictions • Counsel for a record company in a dispute with its supplier • Counsel for a commercial real estate service company in arbitration against a Big Four consulting firm regarding a failed software implementation project • Resolved a dispute between a commercial tenant and its landlord
Financial Services and Insolvency
• Represented a large trust company in a class action and related actions and applications involving alleged breaches of the Consumer Protection Act • Counsel for the monitor in a complex insolvency proceeding, establishing the right of monitors to act as plaintiff in oppression actions • Defended a bank's advisory practice sued for negligence by an auto parts company • Counsel for trustee in bankruptcy in complex recovery proceedings
Administrative and Constitutional
• Represented a provincial new home builder regulator in numerous complex administrative and civil proceedings • Counsel to several municipalities in a constitutional dispute with a national railway • Counsel to animal rights groups in a judicial review of provincial hunting legislation • Appeared in the Supreme Court of Canada in support of the federal government's constitutional reference regarding a national securities regulator • Represented a large online used car dealer in disciplinary proceedings involving alleged regulatory breaches
Technology, Cybersecurity and Privacy
• Breach coach for an international law firm • Advised a nuclear power plant builder in connection with a data breach • Breach coach and cybersecurity advisor for a provincial lottery and gaming corporation in connection with various ransomware and credential stuffing attacks • Advised a U.S. telephone company in a privacy-related dispute with a former service provider • Counsel to an energy sector technology company in connection with a privacy breach caused by a phishing attack • Represented a Web3 technology company in a dispute following a failed metaverse platform project • Defended a U.S. software company in an action by a customer following a failed software implementation project • Breach coach and cybersecurity advisor for the Canadian entity of an international aid NGO • Defended a subrogated claim against a digital infrastructure company in connection with a ransomware attack on a customer • Advised on sales, cybersecurity, and privacy aspects of the asset sale of a public utilities SaaS • Breach coach for a SaaS vendor in the utilities sector attacked by Qilin ransomware • Breach coach for a financial services SaaS vendor in a ransomware attack • Breach coach for a managed services provider struck by a ransomware attack • Counsel to a private investor in connection with a cryptocurrency fraud • Advised U.S. bank victimized by business email compromise • Advised a U.S. company on privacy issues in connection with doing business in Canada and China • Advised a Chinese company in connection with a dispute arising from a phishing attack resulting in a fraudulent payment • Breach coach/counsel for a Canadian subsidiary of a Japanese multinational struck by a ransomware attack • Breach coach/counsel for various SaaS vendor companies afflicted by ransomware, business email compromise and DDOS attacks • Counsel to various companies dealing with insider threats from current/former employees • Represented a chain of rest homes in connection with a payment dispute arising from fraudulent transactions resulting from a cyberattack • Provided strategic advice to a regulator affected by a failed cloud transformation project • Breach coach/counsel for an electric utility victimized by a ransomware attack • Breach coach for an employee recognition software vendor struck by a ransomware attack • Breach coach/counsel for logistics company struck by ransomware attack • Breach coach/counsel for an aerospace parts manufacturer struck by ransomware • Breach coach/counsel for an internationally known musical instrument company victimized by a ransomware attack • Counsel for a geotechnology company victimized by business email compromise
Class Actions
Hands-on legal support and advice during and after cyber incidents, including breach containment, notification obligations, risk mitigation, and managing communications with regulators, affected parties, and the public.
Commercial Litigation and Arbitration
• Defended a Canadian financial institution in dozens of consumer protection disputes and supervised a team of lawyers defending hundreds of similar claims • Counsel for auto parts supplier in dispute with SaaS provider • Represented a large used car dealer in a dispute with a former employee • Advised an international bank in a dispute with its SaaS vendor • Represented an industrial electrical equipment supplier in a dispute with a former contractor • Represented an online home rental marketplace in several arbitrations across Canada • Defended an oil burner manufacturer in several product liability actions • Advised a provincial regulator in a contract dispute with its cloud hosting provider • Counsel for a movie production company in a film rights dispute • Counsel for a country music star in a dispute with their former management company • Represented trustees for a charity in a real estate dispute with a foreign government • Represented a provincial new home warranty program in dozens of administrative and civil proceedings • Represented a Web3 technology company in a dispute following a failed metaverse platform project • Successfully defended clients implicated in a complex fraud action involving multiple defendants and jurisdictions • Counsel for a record company in a dispute with its supplier • Counsel for a commercial real estate service company in arbitration against a Big Four consulting firm regarding a failed software implementation project • Resolved a dispute between a commercial tenant and its landlord
Financial Services and Insolvency
• Represented a large trust company in a class action and related actions and applications involving alleged breaches of the Consumer Protection Act • Counsel for the monitor in a complex insolvency proceeding, establishing the right of monitors to act as plaintiff in oppression actions • Defended a bank's advisory practice sued for negligence by an auto parts company • Counsel for trustee in bankruptcy in complex recovery proceedings
Administrative and Constitutional
• Represented a provincial new home builder regulator in numerous complex administrative and civil proceedings • Counsel to several municipalities in a constitutional dispute with a national railway • Counsel to animal rights groups in a judicial review of provincial hunting legislation • Appeared in the Supreme Court of Canada in support of the federal government's constitutional reference regarding a national securities regulator • Represented a large online used car dealer in disciplinary proceedings involving alleged regulatory breaches
Technology, Cybersecurity and Privacy
• Breach coach for an international law firm • Advised a nuclear power plant builder in connection with a data breach • Breach coach and cybersecurity advisor for a provincial lottery and gaming corporation in connection with various ransomware and credential stuffing attacks • Advised a U.S. telephone company in a privacy-related dispute with a former service provider • Counsel to an energy sector technology company in connection with a privacy breach caused by a phishing attack • Represented a Web3 technology company in a dispute following a failed metaverse platform project • Defended a U.S. software company in an action by a customer following a failed software implementation project • Breach coach and cybersecurity advisor for the Canadian entity of an international aid NGO • Defended a subrogated claim against a digital infrastructure company in connection with a ransomware attack on a customer • Advised on sales, cybersecurity, and privacy aspects of the asset sale of a public utilities SaaS • Breach coach for a SaaS vendor in the utilities sector attacked by Qilin ransomware • Breach coach for a financial services SaaS vendor in a ransomware attack • Breach coach for a managed services provider struck by a ransomware attack • Counsel to a private investor in connection with a cryptocurrency fraud • Advised U.S. bank victimized by business email compromise • Advised a U.S. company on privacy issues in connection with doing business in Canada and China • Advised a Chinese company in connection with a dispute arising from a phishing attack resulting in a fraudulent payment • Breach coach/counsel for a Canadian subsidiary of a Japanese multinational struck by a ransomware attack • Breach coach/counsel for various SaaS vendor companies afflicted by ransomware, business email compromise and DDOS attacks • Counsel to various companies dealing with insider threats from current/former employees • Represented a chain of rest homes in connection with a payment dispute arising from fraudulent transactions resulting from a cyberattack • Provided strategic advice to a regulator affected by a failed cloud transformation project • Breach coach/counsel for an electric utility victimized by a ransomware attack • Breach coach for an employee recognition software vendor struck by a ransomware attack • Breach coach/counsel for logistics company struck by ransomware attack • Breach coach/counsel for an aerospace parts manufacturer struck by ransomware • Breach coach/counsel for an internationally known musical instrument company victimized by a ransomware attack • Counsel for a geotechnology company victimized by business email compromise
Class Actions
Hands-on legal support and advice during and after cyber incidents, including breach containment, notification obligations, risk mitigation, and managing communications with regulators, affected parties, and the public.
Commercial Litigation and Arbitration
• Defended a Canadian financial institution in dozens of consumer protection disputes and supervised a team of lawyers defending hundreds of similar claims • Counsel for auto parts supplier in dispute with SaaS provider • Represented a large used car dealer in a dispute with a former employee • Advised an international bank in a dispute with its SaaS vendor • Represented an industrial electrical equipment supplier in a dispute with a former contractor • Represented an online home rental marketplace in several arbitrations across Canada • Defended an oil burner manufacturer in several product liability actions • Advised a provincial regulator in a contract dispute with its cloud hosting provider • Counsel for a movie production company in a film rights dispute • Counsel for a country music star in a dispute with their former management company • Represented trustees for a charity in a real estate dispute with a foreign government • Represented a provincial new home warranty program in dozens of administrative and civil proceedings • Represented a Web3 technology company in a dispute following a failed metaverse platform project • Successfully defended clients implicated in a complex fraud action involving multiple defendants and jurisdictions • Counsel for a record company in a dispute with its supplier • Counsel for a commercial real estate service company in arbitration against a Big Four consulting firm regarding a failed software implementation project • Resolved a dispute between a commercial tenant and its landlord
Financial Services and Insolvency
• Represented a large trust company in a class action and related actions and applications involving alleged breaches of the Consumer Protection Act • Counsel for the monitor in a complex insolvency proceeding, establishing the right of monitors to act as plaintiff in oppression actions • Defended a bank's advisory practice sued for negligence by an auto parts company • Counsel for trustee in bankruptcy in complex recovery proceedings
Administrative and Constitutional
• Represented a provincial new home builder regulator in numerous complex administrative and civil proceedings • Counsel to several municipalities in a constitutional dispute with a national railway • Counsel to animal rights groups in a judicial review of provincial hunting legislation • Appeared in the Supreme Court of Canada in support of the federal government's constitutional reference regarding a national securities regulator • Represented a large online used car dealer in disciplinary proceedings involving alleged regulatory breaches