Justice Katherine van Rensburg was appointed to the Court of Appeal for Ontario in October 2013. Prior to her appointment to this court she had served on the Superior Court of Justice in the Central West Region since November 2006. As a trial judge, Justice van Rensburg was chambered in Brampton, and presided over criminal, family and civil law matters. She also served on the Divisional Court.

Justice van Rensburg was an associate lawyer and then a partner at the Toronto law firm Smith Lyons LLP, and she became a partner in Gowling Lafleur Henderson LLP with the merger of the two firms in 2001. She practised civil litigation and environmental law, having been certified by the Law Society of Upper Canada as a specialist in each.

Justice van Rensburg is a graduate of the University of Toronto (B.A.), Queen's University (LL.B.) and Cambridge University (LL.M.). She spent her articling year as law clerk for the Honourable Justice Wm. McIntyre at the Supreme Court of Canada.