BookTrust is the UK's largest children's reading charity, based in London, England. The charity works across England, Wales and Northern Ireland. BookTrust was founded in 1921 by Hugh Walpole, Stanley Unwin, and Maurice Marston and Harold Macmillan. Its current Chief Executive is Diana Gerald, who took over from Viv Bird in early 2015. The charity aims to get children reading. Each year, BookTrust reaches 3.9 million children across the UK with books, resources and support to help develop a love of reading, from ages 0 to 16 but with a focus on early years.