About Mason Poratto-Mason LLP

Mason Poratto-Mason LLP is a Sudbury, Ontario law firm that traces back to 1990, when it started out as Desmarais, Ouellette & Mason. It now practises from an office at 40 Larch Street in the city's downtown core, handling family law, wills and estate law, real estate, corporate law, tax appeals, civil law and employment law. Two of its founding partners have since retired: M. James Mason, called to the Ontario bar in 1986, became senior partner in 2003, and Lise Poratto-Mason, called in 1988, had previously worked as a municipal and hospital solicitor. The firm's current lawyers are Adam Mason and Samantha Prescott, both called to the bar in 2018 and both graduates of Lakehead University's Bora Laskin Faculty of Law in Thunder Bay, a law school built to train lawyers for Northern Ontario.

Family law work at the firm covers custody, support and separation, along with child protection matters under Ontario's Child, Youth and Family Services Act. Its tax appeals practice represents individuals and businesses before tax authorities and, where needed, in court. On its site, Mason Poratto-Mason describes its team as having 80 years of combined experience and says it has completed more than 10,500 files for clients. Everyone on the legal team, lawyers and law clerks alike, lists English and French among their languages.

In the community

  • Lise Poratto-Mason has chaired the Greater Sudbury Airport board since 2013.
  • Lise Poratto-Mason has served on the Mason Vale Hospice board and has been part of the National Committee of the Women Moving Woman Campaign since 2008.
  • M. James Mason served as a past board member of the Canadian Charities Foundation and as a past cabinet chair for lawyers with the Sudbury United Way campaign.
  • Samantha Prescott is a Legal Aid Ontario panel lawyer on the family law and child protection panels, volunteers with the Ontario Justice Education Network, started out teaching French-immersion students, and continues to supply teach with the Rainbow District School Board.
  • Kathleen Nutt, the firm's senior law clerk, joined Mason Poratto-Mason LLP in 2017 after more than 15 years of experience in law firm settings.

Good to know

A person using a wheelchairAccessible parkingA rainbow pride heartLGBTQ+ friendlyA blue parking sign beside a car in a parking spaceParking availableA calendar with a checkmark beside a clockBy appointment

Fees & payment

Scales of justice and a gavel above a Legal Aid bannerLegal aid

This firm’s lawyers at a glance

Called to the bar
1986–2018 · median 8 years in practice 3 of 3 lawyers
Law schools
Bora Laskin Faculty of Law, Lakehead University, University of Windsor 2 of 3 lawyers
Languages on the roster
English, French

Where to find them

40 Larch Street, Suite 202, Sudbury, Ontario P3E 5M7 · 705-560-8133

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This listing was generated by AI from public sources in September 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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