Robert J. Lunn received his Juris Doctor from Cornell Law School in 1974 and a B.A. in History and Philosophy from the University of Rochester in 1969. He was admitted to practice in New York State in 1975. Justice Lunn served as an Assistant District Attorney for Monroe County in 1976 and 1977 and was in private practice through 1994 when he was elected to State Supreme Court. He also served as the Town Judge of Penfield from 1992 to 1994.
Justice Lunn is a past member of the New York Pattern Jury Instructions Committee and a former contributing editor and writer for the New York State Bench Book publication. He served on the Task Force Committee of the State Association of Justices of the Supreme Court to study the proposed re-structure and consolidation of trial courts. He has lectured on trial matters for the New York State Bar Association and local Bar Associations. In August 2005, he was designated by Governor Pataki to the Appellate Division, Second Department and in December 2006, he was designated by the Governor to the Appellate Division, Fourth Department. Justice Lunn returned to private practice on January 1, 2009.