What is Siân Berry?
{{Infobox officeholder | honorific-prefix = | name = Siân Berry | honorific-suffix = [[Member of the London Assembly|AM]] | image = Siân Berry, 2018 (cropped).jpg | caption = Siân Berry in 2018 | office = [[Leader of the Green Party of England and Wales]] | alongside = [[Jonathan Bartley]] (2018–2021) | deputy = [[Amelia Womack]] | term_start = 4 September 2018 | term_end = 1 October 2021 | predecessor = [[Caroline Lucas]] | successor = [[Carla Denyer]] and [[Adrian Ramsay]] | office1 = Leader of the [[London Green Party|Greens]] in the [[London Assembly]] | leader1 = {{plainlist| *[[Natalie Bennett]] *[[Caroline Lucas]] *[[Jonathan Bartley]] *Herself}} | term_start1 = 6 May 2016 | term_end1 = 19 October 2018 | predecessor1 = [[Jenny Jones, Baroness Jones of Moulsecoomb|Jenny Jones]] | successor1 = [[Caroline Russell]] | office3 = [[Principal Speaker]] of the [[Green Party of England and Wales|Green Party]] | term_start3 = 24 November 2006 | term_end3 = 30 November 2007 | alongside3 = [[Derek Wall]] | predecessor3 = [[Caroline Lucas]] | successor3 = [[Caroline Lucas]] | office2 = [[London Assembly|Member of the London Assembly]] | assembly2 = London | term_start2 = 6 May 2016 | term_end2 = | predecessor2 = [[Jenny Jones, Baroness Jones of Moulsecoomb|Jenny Jones]] | successor2 = | birth_name = Siân Rebecca Berry | birth_date = {{birth date and age|1974|7|9|df=y}} | birth_place = [[Cheltenham]], [[Gloucestershire]], England | alma_mater = [[Trinity College, Oxford]] | party = [[Green Party of England and Wales|Green]] | religion = | partner = | children = | relatives = | signature = | website = [http://www.si