Named after its founding benefactor, Sir Andrew Barclay Walker, a former mayor of Liverpool and wealthy brewer, the Walker Art Gallery opened in 1877. The Gallery's Director in the early years of the 20th Century, Frank Lambert, first acquired a group of Camden Town pictures to build up a 20th Century Collection. The most significant catalyst for growing the collection in this area has been the philanthropy of Littlewoods retail and football pools company Sir John Moores. Purchases made from the biennial John Moores Painting Prize that has been running since 1957, has seen works including David Hockney's 1967 prize-winning painting Peter Getting Out of Nick's Pool enter the collection. Part One: Gillian Ayres to David Hockney.