Rosen Sack LLP
7 lawyers · City of Toronto
One of 2,345 law firms listed in Toronto, and one of 579 handling Family Law.
Virtual appointments
Virtual appointmentsAbout Rosen Sack LLP
Rosen Sack LLP is a Toronto firm concentrated in family law, estate and capacity litigation, and professional negligence defence for lawyers and their insurers, with mediation and arbitration offered across those areas. Founding partners Avra Rosen and Susan Sack were each called to the Ontario bar in 1987 and later brought their separate practice experience together to start Rosen Sack LLP in 2016. The firm has since grown to include several more partners and lawyers working across the same core areas.
The firm is designated Preferred Counsel for the Lawyers' Professional Indemnity Company, the professional liability insurer for Ontario lawyers, and its estate litigation group works alongside the family law team on cases that touch both areas. Avra Rosen is a Law Society of Ontario Certified Specialist in family law and an accredited family mediator, and is a founding member of The Minerva Group, an association of senior Toronto family law lawyers. The office is at Yonge and St. Clair in midtown Toronto.
Practice areas
Milestones & recognition
- Rosen Sack LLP was founded in 2016 by Avra Rosen and Susan Sack, who were each called to the Ontario bar in 1987 after graduating from Osgoode Hall Law School in 1985.
- Avra Rosen was named the Best Lawyers 2026 Lawyer of the Year for Family Law in Toronto and is a Law Society of Ontario Certified Specialist in family law and an Accredited Family Mediator with the Ontario Association of Family Mediation.
- Susan Sack has been recognized by Best Lawyers for Trusts and Estates, Legal Malpractice Law, and Insurance Law in Toronto for 2025 and 2026.
- The firm is Preferred Counsel for the Lawyers' Professional Indemnity Company, the professional liability insurer for lawyers in Ontario.
- Avra Rosen received the Queen Elizabeth Jubilee Pin in January 2023.
In the community
- Avra Rosen served as President of Holy Blossom Temple, described on the firm's site as the largest Reform Jewish synagogue in Canada, from 2019 to 2022.
- Susan Sack has been involved with Holy Blossom Temple's Out of the Cold program.
- A partner at the firm volunteers annually with the Walsh Family Law Moot and Negotiation Competition, mentoring law students.
Good to know
Wheelchair accessible
Woman-owned
LGBTQ+ friendly
Parking available
Virtual appointments
In-person servicesLawyers 7
Adam Watters
Lawyer
Family Law
Andrea Acri
Partner
Family Law
Avra Rosen
Founding Partner
Family Law
Jenny Bogod
Partner
Wills, Estates & TrustsCivil Litigation & Dispute Resolution
Kate Rawson
Lawyer
Civil Litigation & Dispute ResolutionWills, Estates & Trusts
Kelly Eckert
Partner
Family Law
Susan Sack
Founding Partner
Civil Litigation & Dispute ResolutionWills, Estates & Trusts
Certified Specialists
A designation granted by the Law Society of Ontario, not a self-declared area of focus.
This firm’s lawyers at a glance
- Called to the bar
- 1987–2022 · median 13 years in practice 6 of 7 lawyers
- Law schools
- University of Ottawa (3), Osgoode Hall Law School (2), Queen's University Faculty of Law 6 of 7 lawyers
- Languages on the roster
- Hebrew, Russian
Who handles what
The neighbourhood
Rosen Sack's office is in Suite 500 of 2 St. Clair Avenue West, on the northwest corner of Yonge Street and St. Clair Avenue West in midtown Toronto. It's a short walk from St. Clair subway station on the Yonge line, and the firm directs clients who are driving to a Green P lot on the north side of St. Clair between Heath Street West and Delisle Avenue, with street parking also available nearby. Family law, estate, and professional negligence files often mean several meetings over months rather than a single visit, and the subway and parking access make the midtown location workable for clients coming from across the city.
Frequently asked questions
- Does Rosen Sack handle divorce, separation, and child custody?
- Yes. Family law is one of the firm's core areas, covering separation and divorce, parenting arrangements, child and spousal support, and dividing property and assets. The firm tries to resolve these matters outside of court where it can, through negotiation or mediation.
- Can Rosen Sack help with a will dispute or a question about someone's capacity?
- Yes. The firm's estate litigation team handles will challenges, dependant's support claims, and power of attorney and guardianship disputes, and its estate and family law lawyers work together on cases that touch both areas.
- I'm a lawyer and I've been named in a negligence claim. Can Rosen Sack represent me?
- Yes. Rosen Sack is Preferred Counsel for the Lawyers' Professional Indemnity Company, and its partners have represented lawyers and their insurers in professional negligence matters for decades, both in court and through mediated resolutions.
- Does Rosen Sack offer mediation or arbitration instead of going to trial?
- Yes, for family law matters, and mediation for estate and capacity disputes as well. The firm asks that referrals for mediation or arbitration go through its office by email.
- What languages can I get help in at Rosen Sack?
- Depending on which lawyer handles a file, the firm's lawyers can serve clients in English, French, Russian, or Hebrew.
- Where is Rosen Sack's office and how do I get there?
- The office is at 2 St. Clair Avenue West, Suite 500, at the northwest corner of Yonge and St. Clair in midtown Toronto. It's close to St. Clair subway station, with a Green P lot nearby and street parking as well.
Where to find them
2 St. Clair Avenue West, Suite 500, Toronto, ON M4V 1L5 · 416-214-1200
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