Ronald D. Rotunda (February 14, 1945 – March 14, 2018) was an American legal scholar and professor of law at Chapman University School of Law. Rotunda's first area of primary expertise is United States Constitutional law, and is the author of an influential 6-volume legal treatise on Constitutional Law.[1] His other area of primary expertise is Legal Ethics, often called Professional Responsibility. He has also published an influential treatise on Legal Ethics, co-published by West-Thomson Reuters, ABA. He was also a senior fellow, in 2000, at the Cato Institute in Washington, D.C. In 1963, when Rotunda was 18 years old, he received a scholarship to attend Harvard University.Professor Rotunda later received a J.D. from Harvard Law School.