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Carol Anne O'Brien
Carol Anne O’Brien established her own law practice in 2010 after 12 years (6 as a partner) with the business law firm, Cassels Brock & Blackwell LLP. She works independently and, when required, in collaboration with other lawyers and professional service providers, to offer highly efficient and effective regulatory advice to businesses of all sizes across a broad range of industries.

Call to the Ontario bar:



  • B.A. Hons., Queen's University, 1982
  • M.L.S., University of Toronto, 1984
  • LL.B., University of Ottawa, 1996


  • American Bar Association, Antitrust and Communications Law Sections
  • Canadian Bar Association, Competition Law Section
  • Ontario Bar Association, Entertainment, Media and Communications Law Section

Prior to her career as a lawyer, Carol Anne worked as a librarian at Memorial University of Newfoundland in St. John's, as a business information specialist at Polysar in Sarnia, and as a library manager at Health Canada in Ottawa. She continues to have an interest in libraries. From 2009 to 2016, Carol Anne was member of the Board of Directors for the Southern Ontario Library Service, which provides resources and services to Ontario public libraries. Carol Anne was Vice-Chair of the SOLS Board from 2012 to 2016.

In 2011 Carol Anne completed the Canadian Board Diversity Council's Intermediate Get On Board program for members of Boards of Directors.

Carol Anne and her golden retriever volunteer as weekly visitors at a neighbourhood long-term care facility.