About Marta Watson LLP

Marta Watson LLP is a Toronto law firm built around insurance litigation, acting for insurance company clients in automobile, disability, property, and liability claims. Founding partner Barry Marta was called to the Ontario bar in 1983, and partner Kathryn Watson was called to the bar in 1997. Associate Sandi Smith was called to the bar in 1998. The firm has eight lawyers in total. The firm describes itself as representing a new model for litigation: leaner, more responsive, more collaborative, and built around the evolving needs of insurance companies rather than a traditional law firm structure.

The firm pairs senior and junior lawyers on each file and says it has learned to use technology to minimize time-consuming processes, aiming to keep files moving without losing sight of the bigger picture. Its practice covers automobile litigation, License Appeal Tribunal hearings, commercial general liability, occupiers' liability, property and fire losses, disability and life insurance disputes, subrogation, coverage opinions, municipal liability, WSIB claims, tavern and social host liability, and products liability. Associate Diana Oliveira, an executive board member of the Portuguese Canadian Lawyers Association, practices in Portuguese, and associate William Lewer is fluent in French, giving clients access to services beyond English.

Practice areas

Not listed

In the community

  • Associate Diana Oliveira is an executive board member of the Portuguese Canadian Lawyers Association and serves on the board of directors of the Working Women Community Centre.

Good to know

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This firm’s lawyers at a glance

Languages on the roster
English, French, Portuguese

Where to find them

Marta Watson LLP 438 University Avenue Suite 2000 Toronto ON M5G 2K8 · 416-868-7700

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This listing was generated by AI from public sources in August 2026. It may contain errors, and we can’t guarantee it’s accurate or complete. Before you rely on anything here, verify it on the firm’s own website. Verify licence status in the Law Society of Ontario directory ↗

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