Otta Helene Maree (née Zille ; born 9 March 1951), known as Helen Zille, is a South African politician. She has served as the Chairperson of the Federal Council of the Democratic Alliance since 20 October 2019. From 2009 until 2019, she was the Premier of the Western Cape province for two five-year terms, and a member of the Western Cape Provincial Parliament. She served as Federal Leader of the Democratic Alliance from 2007 to 2015 and as Mayor of Cape Town from 2006 to 2009.