Philippa Thomas is a news presenter at the BBC's London headquarters, where she anchors the television newscast "World News Today" on BBC World and BBC Four. She's also a regular presenter with "The World Tonight" on BBC Radio 4. A veteran correspondent, Thomas has reported for BBC television, radio and online from 24 countries over the last quarter-century. She was based in Washington as a BBC North America correspondent from 1997 to 2001 and as a BBC World anchor from 2007 to 2010. She has travelled with the White House press pack and reported from Ground Zero after the terrorist attacks of Sept. 11, 2001. Thomas was a 2011 Nieman Fellow at Harvard University, studying the use of social media in emerging democracies. She is a frequent speaker on digital media strategies and in 2012 was part of Foreign Policy magazine's list of "100 female tweeters around the world that everyone should follow."