About Donnell Law Group

Donnell Law Group is a litigation firm based in Keswick, Ontario. Its office at 183 Simcoe Avenue serves York Region and reaches into Southern Ontario, with clients in Newmarket, Richmond Hill, Barrie, Bradford and communities as far as the Kawartha Lakes area. Five lawyers practice at the firm, sharing more than 75 years of combined experience across criminal defence, family law, civil and estate litigation, employment law, municipal law and human rights matters.

Principal Iain T. Donnell was called to the Ontario bar in 1990 and has since built a trial practice centred on criminal, civil and municipal litigation. The rest of the team's bar admissions range from 1986 to 2020, so lawyers at different stages of their careers work side by side on the same files. In family law matters the firm says it tries to resolve issues through negotiation and mediation rather than court action where possible.

Milestones & recognition

  • The firm's principal, Iain T. Donnell, was called to the Ontario bar in 1990.
  • One of the firm's lawyers, called to the bar in 1986, has appeared before the Supreme Court of Canada and previously served as a court appointed children's lawyer.

In the community

  • One of the firm's lawyers teaches Alternative Dispute Resolution in the Paralegal Programme at Seneca College's Faculty of Continuing Education.
  • The firm publishes a blog covering criminal, family, wills and estates, and employment law topics for the communities it serves.

Good to know

A person using a wheelchairWheelchair accessibleA calendar with a checkmark beside a clockBy appointment

This firm’s lawyers at a glance

Called to the bar
1986–2020 · median 24 years in practice 5 of 5 lawyers
Law schools
Queen's University (2), Bond University, University of Windsor 4 of 5 lawyers

The neighbourhood

Donnell Law Group's office sits in Keswick, outside the larger urban cores of Newmarket and Richmond Hill to the south. Its lawyers belong not just to the York Region Law Association but also to the Simcoe County, Durham Region and Kawartha Lakes law associations, a spread that fits a practice built to reach smaller towns across a wide stretch of Southern Ontario rather than a single downtown core. The office is at the intersection of Simcoe Avenue and Metro Road South, behind Food Basics, an easy stop for clients driving in from the surrounding region.

Frequently asked questions

What areas of law does Donnell Law Group handle?
The firm practices criminal defence, family law, civil litigation, estate litigation, employment law, municipal law, administrative law and human rights matters out of its Keswick office.
I've been charged with impaired driving in York Region, can Donnell Law Group help?
The firm's criminal lawyers handle impaired driving and other alcohol and drug related charges, and it says it offers 24 hour service for clients who need immediate help after an arrest.
Can Donnell Law Group help with a divorce or custody dispute?
Family law is one of the firm's main practice areas, covering divorce, custody and access, child and spousal support, and domestic contracts such as separation and cohabitation agreements. The firm says it tries to resolve family matters through negotiation and mediation before going to court.
Does the firm handle will disputes or estate planning?
Yes. The firm prepares wills and powers of attorney and handles estate litigation, including will challenges, capacity proceedings and disputes over an executor's or attorney's conduct.
How far does Donnell Law Group travel to serve clients?
From its Keswick office, the firm serves York Region and reaches into Southern Ontario, including Newmarket, Richmond Hill, Barrie, Bradford and communities as far as the Kawartha Lakes area.

Where to find them

183 Simcoe Ave., Keswick, ON, L4P 2H6 · 905-476-9100

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Listing compiled from the firm’s public website in September 2026. Verify licence status in the Law Society of Ontario directory ↗