Welcome to Dang Dang Khoa Channel Categories Celebrity Biography Theresa May Biography by biography.com Theresa May is Britain's first female Prime Minister since Margaret Thatcher. She is considered one of the most powerful Conservative women and was the longest serving home secretaries in British history. Synopsis Following the resignation of David Cameron, Theresa May is Britain's first female PM since Margaret Thatcher and the first to lead the country out of the European Union after its historic Brexit referendum, which was held in June 2016. May is a member of the Conservative Party and originally voted to stay in the EU, despite having reservations. Prior to her taking the top office, she had served as home secretary since 2010 and was elected MP (Member of Parliament) of Maidenhead in 1997