Does Wagner Sidlofsky prepare wills, or does it handle disputes about them?

The firm focuses on litigation rather than drafting. Its estate litigation practice covers will challenges, capacity claims, dependant's relief claims, and executor removal rather than routine will preparation.

I think a family member's power of attorney is being misused. Can the firm help?

Yes. The firm's elder law practice focuses on financial abuse of seniors, watching for warning signs such as unauthorized changes to a power of attorney or unexplained transfers of money, and it can act to remove a compromised attorney or seek restitution through the courts.

Does Wagner Sidlofsky handle shareholder and business partner disputes?

Yes. Commercial litigation, including shareholder disputes, oppression remedy claims, breach of contract, and construction lien matters, is one of the firm's three main practice areas.

How large is Wagner Sidlofsky and where is it located?

The firm's team includes seven partners along with counsel and a group of associates, all working out of a single office at 400 University Avenue in downtown Toronto.

Wagner Sidlofsky LLP | LawOnline Directory

About Wagner Sidlofsky LLP

Wagner Sidlofsky LLP is a Toronto law firm that represents Canadian and international individuals and businesses in disputes. Its own materials describe a single-minded focus on litigation rather than transactional work, concentrated in three areas: estate litigation, commercial litigation, and elder law, particularly financial abuse of seniors. The team includes seven partners along with counsel and a group of associates, working out of one office suite at 400 University Avenue in downtown Toronto. Lawyers appear regularly before the Ontario Superior Court of Justice, the Court of Appeal for Ontario, and various administrative tribunals, and the firm has represented clients before the Supreme Court of Canada.

The name comes from founding partners Charles Wagner and Gregory Sidlofsky. Wagner was called to the Ontario bar in 1985 and holds the Law Society of Ontario's Certified Specialist designation in Estates and Trusts Law. Sidlofsky, the managing partner, holds the Certified Specialist designation in Civil Litigation. Wagner also created and chairs the Estates and Trusts Group at B'nai Brith Canada, a continuing legal education program for lawyers and accountants that began as a small breakfast gathering and later drew close to 200 attendees a year.

Practice areas

Wills, Estates & Trusts

Civil Litigation & Dispute Resolution

Milestones & recognition

Charles Wagner was called to the Ontario bar in 1985 and holds the Law Society of Ontario's Certified Specialist designation in Estates and Trusts Law.
Gregory Sidlofsky, the firm's managing partner, holds the Law Society of Ontario's Certified Specialist designation in Civil Litigation.
An article on majority rule clauses co-authored by one of the firm's partners was cited by the Alberta Court of Appeal in Brodylo Estate (Re), 2023 ABCA 314.
Firm lawyers have written for the Estates Trusts and Pensions Journal, The Lawyer's Daily, and the Advocates' Quarterly, and have spoken at the Law Society of Ontario's Trust and Estate Summit and Osgoode's Estate Litigation certificate program.

In the community

Charles Wagner created the Estates and Trusts Group at B'nai Brith Canada, pairing lawyers and accountants at a kosher venue to discuss estate and trust issues from Jewish and secular legal perspectives, and continues to chair the group.
In a 2018 interview, Wagner said the group had grown from a small breakfast with fewer than a minyan of lawyers to an event expecting close to 200 people that year, with sponsorship support from Scotia Wealth Management since its early years.

Good to know

Wheelchair accessible A rainbow pride heart

LGBTQ+ friendly A blue parking sign beside a car in a parking space

Parking available A laptop showing a video call

Virtual appointments A calendar with a checkmark beside a clock

By appointment An office interior with a desk and chairs

In-person services

Lawyers 16

This firm’s lawyers at a glance

Called to the bar: 1985–2026 · median 3 years in practice 10 of 16 lawyers
Law schools: Osgoode Hall Law School (3), Queen's University (3), Lincoln Alexander School of Law, National University of Ireland, Galway, Thompson Rivers University, University of Ottawa and 2 more 12 of 16 lawyers
Languages on the roster: English, Hebrew, Mandarin, Russian

Who handles what

The neighbourhood

The firm's office is at 400 University Avenue, Suite 1600, on the stretch of University Avenue that Toronto treats as its ceremonial civic spine, home to Osgoode Hall and the Toronto Courthouse among its landmarks. That makes it a fitting address for a firm whose lawyers spend most of their time in court rather than at a closing table. The building itself sits within direct reach of the St. Patrick subway station, so clients coming downtown for a hearing or a meeting don't need a car to get there.

Frequently asked questions

Does Wagner Sidlofsky prepare wills, or does it handle disputes about them?: The firm focuses on litigation rather than drafting. Its estate litigation practice covers will challenges, capacity claims, dependant's relief claims, and executor removal rather than routine will preparation.
I think a family member's power of attorney is being misused. Can the firm help?: Yes. The firm's elder law practice focuses on financial abuse of seniors, watching for warning signs such as unauthorized changes to a power of attorney or unexplained transfers of money, and it can act to remove a compromised attorney or seek restitution through the courts.
Does Wagner Sidlofsky handle shareholder and business partner disputes?: Yes. Commercial litigation, including shareholder disputes, oppression remedy claims, breach of contract, and construction lien matters, is one of the firm's three main practice areas.
What courts and tribunals does Wagner Sidlofsky appear before?: The firm's lawyers appear before the Ontario Superior Court of Justice, the Court of Appeal for Ontario, and various administrative tribunals, and the firm has represented clients before the Supreme Court of Canada.
How large is Wagner Sidlofsky and where is it located?: The firm's team includes seven partners along with counsel and a group of associates, all working out of a single office at 400 University Avenue in downtown Toronto.
Does Wagner Sidlofsky only take cases in Toronto?: No. The firm describes itself as representing Canadian and international individuals and businesses in disputes, not only clients local to its downtown Toronto office.

Where to find them

400 University Avenue, Suite 1600, Toronto, Ontario M5G 1S5 · 416-366-6743

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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 ↗