Diane Di Ianni practiced law for two decades, focusing in the areas of litigation, civil rights and public sector law and serving for four years as general counsel to the Boston Public Schools. She was a long-serving member of the Massachusetts Board of Bar Overseers panel on attorney discipline and, in 2006, was appointed to the Board of Bar Overseers by the Massachusetts Supreme Judicial Court. Active in the bar, she served as chair of the Massachusetts Joint Bar Committee on Judicial Appointments and as chair of the Administration of Justice Section of the Boston Bar Association. After relocating to Tennessee, she practiced in the area of government relations, representing the interests of education-related clients in the Tennessee General Assembly. She was appointed by the United States Commission on Civil Rights to the Tennessee State Advisory Committee as a member in 2011, and currently serves as its chair. She is a member of the International Association of Legal Ethics and the ABA Center for Professional Responsibility. In 2016, she was appointed by the United States Commission on Civil Rights to a four-year term as chair of the Tennessee Advisory Committee. She serves on the Metro-Nashville Board of Ethical Conduct, and is a member of the International Association of Legal Ethics and the ABA Center for Professional Responsibility.