Mario Delgado

Profile

Mario Delgado is a Partner in DWF’s Toronto office and a senior litigation lawyer trusted by insurers, underwriters, municipalities, and institutional clients to manage complex, high‑exposure insurance disputes. He is routinely retained on factually intensive and legally challenging matters where the stakes are significant, and the issues demand strategic judgment, decisiveness, and experienced advocacy.

Mario’s practice encompasses construction litigation, major property and environmental losses, product liability, professional indemnity, abuse claims, employment‑related human rights disputes, and class actions. He is regularly engaged by insurers, underwriters, self‑insured entities, municipalities, and other institutional clients across a broad range of industries, providing strategic advice and advocacy in matters where careful risk management and decisive litigation strategy are essential.

He is frequently entrusted with files involving sensitive allegations, reputational risk, and complex evidentiary records, including matters presenting aggregate, systemic, or class action exposure, and is adept at navigating disputes that require a careful balance of legal rigour, discretion, and practical resolution. Mario is particularly valued for his ability to cut through complexity, identify the key drivers of risk, and advance strategies aligned with his clients’ commercial, operational, and public‑sector objectives.

Mario is often engaged at an early stage of a dispute to provide strategic advice, risk assessment, and claims management guidance, including in matters involving class action risk, coverage considerations, and pre‑certification strategy, and regularly defends cases through litigation, mediation, and appeal.

An experienced advocate, Mario appears regularly before the Ontario Superior Court of Justice, the Divisional Court, the Court of Appeal for Ontario, and administrative and regulatory tribunals. He has extensive experience managing matters involving voluminous documentary records, expert evidence, and sensitive witness testimony, including in complex, multi‑party and class proceedings.

Clients and colleagues recognize Mario for his calm, pragmatic approach, his responsiveness, and his ability to manage difficult files efficiently while maintaining a clear focus on outcomes. He works closely with adjusters, brokers, underwriters, municipal representatives, and in‑house legal teams to ensure matters are advanced strategically and cost‑effectively, particularly where early positioning can materially affect exposure.

Mario’s representative work includes:

Class Actions

• Representing clients across various industries, including health and medical devices, product failures, property losses, environmental issues and investor fraud
• Providing risk litigation and management advise before a claim is issued
• Advising on key issues relating to pre-certification procedures, certification, dismissal, discontinuance and settlement solutions

Environmental

• Acting in matters relating to development projects, pipelines, emissions, oil spills and soil contamination and contamination entering the water table
• Defending claims involving spill and long-term pollution contamination events, particularly in the construction and energy sectors
• Advising stakeholders in environmental matters and providing strategic advice in minimizing their risk exposure

Products Liability

• Defending product liability disputes involving various commercial, industrial and dental products/materials and successfully responding to various allegations of deficiency: design, negligent or deficient manufacturing, negligent installation and failure to instruct on use of the product/material

Professional Indemnity

• Representing inspectors, architects, engineers, dentists, teachers (and school boards), naturopaths, psychotherapists, optometrists, insurance brokers, paralegals and property managers, among others, in cases involving claims of alleged negligence in the performance of their professional responsibilities
• Represented two design professionals at the Elliot Lake Inquiry that was commissioned to investigate the causes of the Algo Centre Mall collapse, which left 19 people injured and resulted in two deaths
• Acted in a quasi-criminal matter relating to a claim of sexual assault arising from the administration of anesthetics during a surgical procedure

Medical Malpractice

• Defending practitioners in civil proceedings and at various administrative tribunals, including involvement in matters arising from the failure to diagnose, provide reasonable treatment, obtain consent, carry out treatment in accordance with relevant standards and provide adequate post-operative care He routinely defends practitioners in cases involving allegations that the practitioner has failed to meet the standards expected by the regulatory body.

Construction Law

• Defending all parties along the construction pyramid (general contractors, design professionals, subcontractors and suppliers) in claims arising from all stages of the construction process including, errors and omissions in design phase, bidding and tendering process, over-certification, lien claims, fee disputes, product liability and delay claims
• Defending claims arising from all types of construction projects, including the design and construction of single residential homes, townhome developments, condominiums, industrial buildings, banks, medical buildings, commercial retail buildings, educational centers, recreational buildings, sporting arenas and medical buildings, among others

Employment, Human Rights, and Abuse Litigation

• Defending practice representing insureds, institutional clients in employment‑related litigation, human rights claims, and abuse matters.
• Regularly retained to defend wrongful dismissal claims, human rights applications, and civil proceedings arising from allegations of workplace harassment, discrimination, and abuse, including matters involving sensitive factual records and reputational risk.

In addition to his litigation practice, Mario is actively involved in mentoring junior lawyers and contributing to the continued development of DWF’s litigation, insurance, class action, and public‑sector capabilities in Canada.