Alfred Sisley,1839 to 1899, was an Impressionist landscape painter who was born and spent most of his life in France, but retained British citizenship. He was the most consistent of the Impressionists in his dedication to painting landscape en plein air 'outdoors'. He deviated into figure painting only rarely and, unlike Renoir and Pissarro, found that Impressionism fulfilled his artistic needs. Among his important works are a series of paintings of the River Thames, mostly around Hampton Court, executed in 1874, and landscapes depicting places in or near Moret-sur-Loing. The notable paintings of the Seine and its bridges in the former suburbs of Paris are like many of his landscapes, characterized by tranquility, in pale shades of green, pink, purple, dusty blue and cream. Over the years Sisley's power of expression and color intensity increased. Among Sisley's best-known works are Street in Moret and Sand Heaps, both owned by the Art Institute of Chicago, and The Bridge at Moret-sur-Loing, shown at Musée d'Orsay, Paris. Allée des peupliers de Moret has been stolen three times from the Musée des Beaux-Arts in Nice