Peter Murray is currently teaching Evidence at Harvard Law School, where he has been a full- and part-time faculty member since 1993. In 1973 he and retired HLS Professor Richard H. Field, as Consultants to the Maine Evidence Rules Advisory Committee, drafted the Maine Rules of Evidence as patterned after the Federal Rules of Evidence then in the process of adoption by Congress. Professor Murray served as Consultant to the Committee until 2017 and over this more than 40-year time span prepared and proposed numerous amendments to the Maine Rules, including Rule 616 addressing the use of illustrative aids.

He is the author of Maine Evidence now in its 7th Edition (1st edition with Field) and Basic Trial Advocacy (1995) and a co-author of Green, Nesson and Murray, Problems, Cases and Materials on Evidence (3rd and 4th Editions). His academic work has focused on Evidence, Trial Advocacy and Comparative Civil Justice. He is the author of German Civil Justice (with Stuerner).

In addition to his academic work, Professor Murray has had an active career as a trial lawyer in civil and criminal matters in Portland, Maine.