What is John Bercow?
{{Infobox officeholder | honorific-prefix = [[The Right Honourable]] | name = John Bercow | honorific-suffix = | image = John Bercow.JPG | imagesize = 200px | caption = Bercow in 2009 | office = 157th [[Speaker of the House of Commons (United Kingdom)|Speaker of the House of Commons of the United Kingdom]] | monarch = [[Elizabeth II]] | primeminister = {{List collapsed|title={{nobold|''See list''}} | [[Gordon Brown]] | [[David Cameron]] | [[Theresa May]] | [[Boris Johnson]] }} | deputy = {{List collapsed|title={{nobold|''See list''}} | '''First Deputy''' | Lindsay Hoyle | '''Second Deputy''' | [[Sylvia Heal]]<br />(2009–2010) | [[Nigel Evans]]<br />(2010–2013) | [[Eleanor Laing]]<br />(2013–2019) | '''Third Deputy''' | [[Michael Lord]]<br />(2009–2010) | [[Dawn Primarolo]]<br />(2010–2015) | [[Natascha Engel]]<br />(2015–2017) | [[Rosie Winterton]]<br />(2017–2019) }} | term_start = 22 June 2009 | term_end = 4 November 2019 | predecessor = [[Michael Martin, Baron Martin of Springburn|Michael Martin]] | successor = [[Lindsay Hoyle]] | office1 = [[Shadow Secretary of State for International Development]] | leader1 = [[Michael Howard]] | term_start1 = 10 November 2003 | term_end1 = 8 September 2004 | predecessor1 = [[Caroline Spelman]] | successor1 = [[Alan Duncan]] | office2 = [[Shadow Chief Secretary to the Treasury]] | leader2 = [[Iain Duncan Smith]] | term_start2 = 18 September 2001 | term_end2 = 23 July 2002 | predecessor2 = [[Oliver Letwin]] | successor2 = [[Howard Flight]] | office3 = [[Member of Parliament (United Kingdom)|Member of Parliament]]<br />for [[Buckingham (UK Parliament constituency)|Buckingham]] | term_start3 = [[1997 United Kingdom general election|1 May 1997]] | term_end3 = 4 November 2019 | predecessor3 =