Justice William E. McCarthy graduated from the State University of New York at Potsdam and Albany Law School. He served as a confidential law clerk to Supreme Court Justice Edward Conway from 1990 until 1993, for Justice Joseph Harris from 1994 until 1997, and for Judge Edward Sheridan of the Court of Claims from 1997 until 1998. McCarthy then worked as Senior Assistant Counsel to Governor George Pataki until 2004.
That year, McCarthy was appointed to the Supreme Court for the Third Judicial District. In 2006, he served as Justice-in-charge of the Commercial Division of the Supreme Court for Albany County and was appointed as an Associate Justice of the Appellate Division, Second Department. In January 2009, he was appointed to the Third Department.
Additionally, Justice McCarthy was a member of the New York State CPLR article 81 Guardianship Committee. He was formerly an adjunct professor at Siena College.
"Justice William E. McCarthy." New York State Supreme Court, Appellate Division Third Department. Web. 17 May 2012. http://www.nycourts.gov/ad3/Bios/McCarthyBios.html.