Paul William Barry Marsden (born 18 March 1968) is a British writer, businessman and former politician. He was the Member of Parliament (MP) for Shrewsbury and Atcham from 1997 until 2005. He was most prominently known for his anti-war views and crossing the floor twice (the first to do so since Winston Churchill), from Labour to the Liberal Democrats in 2001 and returning to Labour in 2005. He instructed a solicitor in 2010 to begin action for phone hacking that allegedly took place back in 2003 by a newspaper. In 2012, Marsden was appointed to draft the parliamentary inquiry report into VIP security at the Olympic and Paralympic Games in London. Currently Marsden is Head of Business Intelligence at the construction company MWH Global.