 He was a tenured professor at Columbia Law School (Charles Keller Beekman Professor of Law) from 1979 to 1980, and at Georgetown Law Center from 1980 until his death in 2010.In 1971, Ginsburg's firm represented Ross Perot in a business matter, and the two men became close friends.After President Jimmy Carter nominated his wife to the U.S. Court of Appeals for the District of Columbia Circuit in 1980, Ginsburg reached out to Perot and other influential friends to assure her Senate confirmation.