Andrea Mitchell, the NBC News correspondent, is to be married today to Alan Greenspan, the chairman of the Federal Reserve Board. Associate Justice Ruth Bader Ginsburg of the Supreme Court will officiate at the Inn at Little Washington in Washington, Va.

The bride, 50, is the television network's chief foreign-affairs correspondent, based in Washington. Ms. Mitchell, who is keeping her name, has also covered the White House, Congress and national political campaigns for NBC. She graduated from the University of Pennsylvania, where she is a trustee.

She is the daughter of Cecile and Sydney Mitchell of New York. Her father, now retired, was a founder and the chief operating officer of the Loroman Company, a furniture manufacturer in Manhattan. He was the president of Beth El Synagogue in New Rochelle, N.Y., from 1952 to 1992. Her mother, also retired, was an administrator at the New York Institute of Technology in Manhattan.

The bridegroom, 71, has been the Federal Reserve chairman since 1987. He was the chairman of the Council of Economic Advisers in the Ford Administration and the chairman of the National Commission on Social Security Reform in 1982 and 1983. From 1954 to 1974 and from 1977 to 1987, he was the chairman and president of Townsend-Greenspan & Company, a New York economic consulting concern. He graduated from New York University, from which he also received master's and Ph.D. degrees in economics. He also studied at the Juilliard School and plays the clarinet and saxophone.