Bill Keller became executive editor of The New York Times in July 2003.  Before that Mr. Keller had been an Op-Ed columnist and senior writer for The New York Times Magazine as well as other areas of the newspaper since September 2001. Previously, he served as managing editor from 1997 until September 2001 after having been the newspaper's foreign editor from June 1995 until 1997.  He was the chief of The Times bureau in Johannesburg from April 1992 until May 1995.  Before that Mr. Keller had been a Times correspondent in Moscow from December 1986 until October 1991, the last three years as the newspaper's bureau chief.  He won a Pulitzer Prize in March 1989 for his coverage of the Soviet Union.  Mr. Keller joined The New York Times in April 1984 as a domestic correspondent based in the Washington bureau.  Before coming to The Times, Mr. Keller had been a reporter for The Dallas Times Herald since October 1982.  From 1980 until 1982, he was a reporter for the Congressional Quarterly Weekly Report in Washington, covering lobbyists and interest groups.  He was a reporter for The Portland Oregonian from July 1970 until March 1979.