Sian Berry has lived in London since 1997 and has worked as a medical copywriter, PA, website manager, project manager for a digital start-up, author and transport campaigner before being elected to the London Assembly in 2016.
She has been a local councillor in the Highgate ward of Camden since 2014. She was one of the Green Party's Principal Speakers from 2006 to 2007, and stood as candidate for London Mayor in 2008 and 2016.
In 2003 Sian co-founded the Alliance against Urban 4×4s, was a driving force behind the Reheat Britain campaign that secured a boiler scrappage scheme in 2009 and worked for Campaign for Better Transport from 2011 to 2015. She is a member of the Compass Management Committee and the board of the Carplus Trust.