Mark Barrett

Mark Barrett was educated at McMaster University (B.A., 1986; M.A., 1988) and the University of Toronto (LL.B., 1994). Mark was called to the Bar in Ontario in 1996. He became a partner of O'Donnell, Robertson & Partners in 2003. His litigation practice has encompassed a wide range of insurance issues and cases.

Practice Focus:

  • Provides insurance coverage advice and guidance to property and casualty insurers on a wide variety of claims.
  • Litigation in insurance coverage disputes involving bodily injury and property damage liability claims, sexual abuse claims, first party property claims and directors and officers claims.
  • Acts in the defence of various errors and omissions, professional liability, products liability, personal injury and sexual abuse claims.
  • Appeared as counsel at all levels of court in Ontario.


  • Law Society of Upper Canada