Sullivan Mahoney LLP

Sullivan Mahoney LLP is one of Niagara's largest law firms, founded in 1953. With over 70 years of practice, the firm has built a reputation for impeccable service, thorough and pragmatic legal advice, and complete commitment to its clients. The firm includes generalists and lawyers who are leaders in their practice areas, with certified specialists serving the local communities with both legal expertise and corporate responsibility.

Practice areas

Administrative & Regulatory Law Business & Corporate Law Civil Litigation & Dispute Resolution Construction Law Criminal Defence Employment & Labour Law Wills, Estates & Trusts Family Law Real Estate Law Tax Law

Good to know

Wheelchair accessibleBy appointment

Lawyers 33

This firm’s lawyers at a glance

Called to the bar

1972–2025 · median 19 years in practice 31 of 33 lawyers

Law schools

University of Windsor (6), University of Western Ontario (5), Queen's University (4), University of Ottawa (3), University of Saskatchewan (2), Dalhousie University and 11 more 32 of 33 lawyers

Languages on the roster

English, French, Italian

Who handles what

• Civil Litigation & Dispute Resolution
  Adam Patchet, Andrea M. Mannell, Bradley J. Troup, Bruce A. Macdonald, Carly White, Danielle Thomas, Diana M. Continenza, Gabriel Costantini, Lesley K. Parsons, Michael J. Bonomi, Patrick J. Lyons, Peter A. Mahoney, Richard C. Corbett, Sam Greenlaw, Sean A. Lewis, Sheryl L. Johnson, Thomas A. Richardson, Thomas G. Hanrahan, Woodward B. Mckaig
• Business & Corporate Law
  Amber N. Harwood, Carmelina D'Angelo, D. Andrew Maloney, David M. Willer, Erica L. Bush, Italia M. Gilberti, Lana T. Sgambelluri, Patrick A. Bush, Rocco Vacca, Sarah H. Wilcox, Thomas Wall
• Wills, Estates & Trusts
  Amber N. Harwood, Bruce A. Macdonald, Carmelina D'Angelo, D. Andrew Maloney, Erica L. Bush, Italia M. Gilberti, Lana T. Sgambelluri, Patrick A. Bush, Peter A. Mahoney, Rocco Vacca, Sarah H. Wilcox
• Administrative & Regulatory Law
  Andrea M. Mannell, Evan B. Alderman, Italia M. Gilberti, J. Patrick Maloney, Rocco Vacca, Sara J. Premi, Sheryl L. Johnson, Thomas A. Richardson, Thomas G. Hanrahan, Woodward B. Mckaig
• Real Estate Law
  Amber N. Harwood, D. Andrew Maloney, David M. Willer, Erica L. Bush, Italia M. Gilberti, Lana T. Sgambelluri, Patrick A. Bush, Rocco Vacca, Sarah H. Wilcox
• Employment & Labour Law
  Bradley J. Troup, Michael J. Bonomi, Patrick J. Lyons, Sam Greenlaw, Sean A. Lewis, Sheryl L. Johnson, Woodward B. Mckaig
• Family Law
  Bruce A. Macdonald, Carly White, Diana M. Continenza, Gabriel Costantini, Richard C. Corbett
• Tax Law
  Adam Patchet, Carmelina D'Angelo, David M. Willer
• Construction Law
  Danielle Thomas, Peter A. Mahoney
• Criminal Defence
  Bruce A. Macdonald, Richard C. Corbett
• Personal Injury
  Diana M. Continenza, Lesley K. Parsons

Offices 2