About Sioui Mitts Seufert

Sioui Mitts Seufert is a full-service law firm in Trenton, part of the City of Quinte West in southeastern Ontario. The practice traces back to the early 1950s, when Roderick S. Campbell opened a law office in Trenton that continued until 1982. Bertram R. Garrett joined as an associate in 1972, and when Thomas H. Fleming joined in December 1999 the firm became Fleming Garrett Sioui. It has since taken its current name, Sioui Mitts Seufert, reflecting the present partnership.

The firm now has four lawyers, Devin R. Mitts, Jennifer L. Seufert, Caterina E. Gucciardi, and John S. Wonnacott, practising family law and civil litigation, real estate and land use planning, corporate and business law, wills and estate planning, and criminal defence. Gucciardi holds a master's degree in alternative dispute resolution, completed in 2010, and is a qualified mediator and arbitrator. Wonnacott was called to the bar in both Ontario and Nunavut and has practised criminal law for more than three decades. The firm calls itself the only full-service law firm in the City of Quinte West and offers prospective clients a confidential 30-minute consultation.

In the community

  • Sioui Mitts Seufert is a member of the Quinte West Chamber of Commerce and the Hastings County Law Association.

Good to know

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Where to find them

21 Quinte Street, PO Box 397, Trenton, ON K8V 5R6 · 613-965-6430

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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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