About David

At Sullivan Mahoney, David M. Willer works across commercial real estate, general corporate and commercial matters, commercial leasing, and wills and estates, with real estate files spanning the purchase, sale, financing, and development of shopping centres, vacant land, industrial facilities, and hotels. His corporate work ranges from asset sales to share purchases, and he also assists clients with corporate reorganizations and tax and estate planning. He earned a B.A. (Hons.) from the University of Toronto's St. Michael's College in 1999, a J.D. from the University of Toronto in 2002, and an LL.M. in Taxation from Osgoode Hall (York University) in 2019, and was called to the Ontario bar in 2003. He completed Parts I and II of the CICA In-Depth Tax Course and the Canadian Securities Course, and has taught Law and Construction Contracts at George Brown College and Business Law at Brock University. He is a member of the Ontario Bar Association, the Lincoln County Law Association, the Canadian Tax Foundation, and the Niagara Tax Consultation Group, an affiliate member of the Society of Trust and Estate Practitioners (Canada), a director of Family and Children's Services Niagara, and president of the Historical Society of St. Catharines.

Education & credentials

Law school
University of Toronto
Undergraduate
University of Toronto (St. Michael's College), B.A. (Hons.)
Other degrees
LL.M. in Taxation, Osgoode Hall (York University)

Is this you?

Fix or remove this listing, or add a free listing badge

Something wrong with this listing? Tell us and we’ll hide it right away while we review your request, then correct it or take it down.

Add your free listing badge

Add the free LawOnline listing badge to your website. It tells visitors you’re listed in an independent Canadian lawyer directory and links back to this profile. Being listed isn’t a certification or an endorsement, and the badge doesn’t mean we’ve checked your credentials.

LawOnline.ca Canadian Lawyer Directory listing badge

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 their firm’s website. Confirm David M. Willer’s licence and standing in the Law Society of Ontario directory ↗

How this data is compiled and checked · Correct or remove this listing