The Doctrine of Res Judicata in Canada
Donald is the author of a major book on a fundamental doctrine of the court system, The Doctrine of Res Judicata in Canada, 4th ed. (LexisNexis, 2015, 588 pp.). His book is about lawsuits and explains why a person can only sue once for each case. It is a comprehensive reference source for judges and counsel anaylzing the law of Canada from 1820 to 2015. The book has been quoted by courts and tribunals across Canada, including the Supreme Court of Canada on six occasions, several times by the Ontario Court of Appeal and Ontario Superior Court of Justice, and by all other provincial courts of appeal and provincial trial courts. It has been described as a “highly influential work . . . which is widely cited and generally relied upon as authoritative in Canadian Courts”: Canadian Civil Procedure Law, 2nd ed. (LexisNexis, 2010) at 232. Donald provides expert advice to law firms and litigants across Canada on the doctrine of res judicata.
. . . I would recommend to counsel the recent text of The Doctrine of Res Judicata in Canada by Donald J. Lange, published in September, 2000 by Butterworth’s. In that text the author covers in great detail the history of, and the present state of, res judicata jurisprudence in Canada. I found this text of great assistance in dealing with this matter.
In Burgess v. Canada (Royal Canadian Mounted Police),  B.C.J. No. 2411 at par. 13Brecknell J.