• 2026-10-14

Matthew L.O. Certosimo

Matthew Certosimo is a mediator and arbitrator with ADR Chambers. Matt has over 34 years’ experience in all areas of employment and labour disputes including wrongful/constructive dismissal, grievance arbitrations, human rights, workplace disputes, labour relations, workers’ compensation, collective bargaining, employment...
  • 2026-10-05

Norman A. Keith

Norman (Norm) Keith is a mediator, arbitrator and investigator with ADR Chambers. Norm has experience in employment, labour relations, human rights, ethics violations, commercial, corporate governance, executive misconduct, construction and securities law.  He also has experience resolving disputes in alcohol and drugs in...
  • 2026-08-18

Richard Macklin

Richard is a mediator and arbitrator with ADR Chambers. Richard served part-time, from 2006 to 2018, as a Vice-Chair with the License Appeal Tribunal for Ontario, conducting hearings and arbitrations. Richard has also been a civil litigator for over 30...
  • 2026-03-11

The Honourable Robert Keith Rae

Bob Rae is an arbitrator and mediator with ADR Chambers. Mr. Rae is a Canadian lawyer, diplomat, and former politician whose career spans senior roles in public office, law, and international diplomacy. He built a distinguished career as a mediator,...
  • 2026-02-27

Brian A. Blumenthal

Brian is a mediator, arbitrator and investigator with ADR Chambers.  He has extensive experience in the administrative justice sector in Ontario. His areas of expertise includes employment and human rights disputes, sexual harassment, workplace harassment, discrimination and reprisal, occupational health...
  • 2025-01-03

Allan J. Stitt

Allan J. Stitt is a mediator and arbitrator at ADR Chambers. He specializes in commercial, employment, governance, harassment, human rights, workplace, personal injury, sports, contracts, transportation, investments and franchise disputes.While at Harvard Law School, he studied negotiation and ADR.
  • 2025-01-03

The Honourable Michael L. Phelan

The Honourable Michael L. Phelan is a mediator and arbitrator. Michael specializes in competition law and intellectual property disputes.
  • 2025-01-03

W. A. Derry Millar

W. A. Derry Millar, mediator and arbitrator at ADR Chambers. He specializes in commercial, estates, environmental, insurance, aviation, products liability, investment dealers, wrongful/constructive dismissal, medical/health industry, public policy and intellectual property disputes.
  • 2025-01-03

The Honourable John C. (Jack) Major

The Honourable John C. (Jack) Major, mediator and arbitrator at ADR Chambers. He specializes in personal injury, aviation & air, libel & slander, oil & gas, public policy, professional liability and sports disputes.
  • 2025-01-03

The Honourable Thomas R. Lederer

Thomas Lederer is a retired judge. He conducted civil trials involving commercial transactions, product liability, estates and constitutional issues.  He is available for mediations, arbitrations and investigations
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