Leon Letwin's writing and research interests include civil procedure, criminal law, and evidence. Professor Letwin has advanced the UCLA School of Law's diversity program. He received the School of Law's Rutter Award for Excellence in Teaching in 1983 and was elected Professor of the Year by the Class of 1975.
Professor Letwin engaged in a general law practice in Milwaukee during the 1950's and 1960's, and he undertook a number of pro bono cases in the '60s, including the representation of college students in proceedings arising out of their participation in anti-war demonstrations, and the representation of public school students seeking the right to distribute written material on school grounds without prior censorship by school authorities.
He is author of Evidence Law: Commentary, Problems, and Cases (1987) and editor of Assignments in Trial Practice (1964).