 After law school, she moved to Butte, Montana, where she served as a law clerk for Senior United States District Court Judge William Daniel Murray.After her clerkship ended in 1977, Gray practiced law as in-house corporate counsel for Atlantic Richfield and the Montana Power Company as well as in a solo practice.During the 1980s, she was a lobbyist at the Montana Legislature, representing the Montana Trial Lawyers Association, Montana Power Company and related interests.