About Mason Bennett Johncox

Mason Bennett Johncox is a law firm based in Brooklin, Ontario, with a second office in Port Perry, serving Durham Region and south-central Ontario. Robin Mason and Patrick Bennett founded the firm in Durham Region in 1994. Ian Johncox, who was called to the Ontario Bar in 1996, joined soon after and has practiced in the region since then. The firm's lawyers work in business and corporate law, employment law, real estate law, civil litigation, wills and estate administration, and mediation, and the firm also offers notary and commissioner services.

A few lawyers on the team bring experience from outside Durham Region. Jocelyne Boissonneault practiced intellectual property litigation in Silicon Valley from 2001 to 2004 before returning to focus on criminal and mental health law, and belongs to both the Law Society of Ontario and the California State Bar. Robin Mason, now retired from the firm, is a Registered Canadian Trademark Agent. Ian Johncox wrote a business law column for the Durham Business Times from 1999 to 2009 and a column called Legal Briefs for Kawartha Lakes This Week from 2000 to 2007. The Brooklin office is in a historic building on Baldwin Street North, and the Port Perry office operates out of the Allison House, built in the 1880s.

In the community

  • Patrick Bennett is a Past President of the Rotary Club of Whitby Sunrise and a Paul Harris Fellow.
  • Patrick Bennett is President of St. Thomas' Child Care Centre and a Director of the Whitby Sunrise Claudio 'Nick' Sorichetti Charitable Foundation.
  • Patrick Bennett presents regularly at the Durham Region Association of Realtors' Education Day.
  • Ian Johncox served as President of the Greater Oshawa Chamber of Commerce from 2001 to 2002 and belongs to the Whitby, Greater Oshawa, and Scugog Chambers of Commerce.
  • Jocelyne Boissonneault is a past Chair and current member of the City of Kawartha Lakes Human Services and Justice Coordinating Committee.
  • Brandon McBride is a member of the Rotary Club of Whitby and a former director of the Whitby Chamber of Commerce.

Good to know

A person using a wheelchairAccessible parkingA laptop showing a video callVirtual appointmentsAn office interior with a desk and chairsIn-person services

This firm’s lawyers at a glance

Called to the bar
1993–2025 · median 22 years in practice 4 of 5 lawyers

Offices 2

79 Baldwin Street North, Brooklin, ON L1M 1A4

229 Mary Street, Port Perry, ON L9L 1B7

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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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