About Gabriel

Gabriel Costantini is an associate at Sullivan Mahoney LLP practising in family law and civil litigation. He holds a Juris Doctor from Western University and a Bachelor of Science in Medical Sciences from Brock University. He joined the firm as a summer and articling student and now serves clients throughout the Niagara Region.

Practice areas

Family Law Civil Litigation & Dispute Resolution

Listing compiled from public sources in July 2026. Confirm Gabriel Costantini’s licence and standing in the Law Society of Ontario directory ↗