Donald J. Lange, LL.B., Ph.D.

Donald J. Lange, B.A., LL.B., Ph.D. (Cantab.), of the Ontario Bar, is a lawyer and a scholar. He is well qualified to write this definitive Canadian treatise on res judicata and give counsel on this doctrine. Dr. Lange received his LL.B. in 1982 from Osgoode Hall Law School and did his doctoral work at Trinity College, Cambridge. He has practised exclusively in the area of civil litigation for over 30 years and has successfully argued many cases at the trial and appellate level. In 2003, he was appointed a Deputy Judge of the Ontario Small Claims Court and, in that capacity, has rendered many reported judgments. Earlier in his career, Dr. Lange taught civil litigation courses at the Law Society of Upper Canada and was a law clerk to the Ontario Court of Appeal. His articles on law have been published in leading periodicals such as the Canadian Bar Review and the Osgoode Hall Law Journal and he is a regular legal columnist for an Ontario newspaper. Dr. Lange provides expert evidence, opinions, and co-counsel services to law firms across Canada on the doctrine of res judicata.

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