Robert Thegerström (1857–1919) was a Swedish visual artist born in London, but active in Stockholm. He studied at the Art Academy in Stockholm, arrived in Paris as late as 1880, and would devote himself extensively to plein air painting on the Atlantic coast and in Grez-sur-Loing. In 1880 he traveled to Paris where he came to spend twelve years with studies and his free artistry. He studied figure and landscape painting at several reputable studios, including at the Académie Julian, where he orientated himself in salon painting, which set the tone for the time, with realistic open-air studies and figure depictions. With his good finances and social standing, he came to play a significant role among the Swedish artists in Paris. Thegerström was one of the central figures in the socializing at artists' pubs and studios. He was part of the Opponents' core squad. When Thegerström returned to Sweden, he began to depict the Swedish landscape in atmospheric tones, performed public works and above all became a portrait painter with e.g. writer and musician as a model. Thegerström was a close friend of Anders Zorn and was impressed by his plein air painting, which can be seen, among other things, in the well-known painting "Lättja". Thegerström married in 1887 Elin Lamm, who is assumed to be the one depicted in the painting, "Lättja". She was the cousin of Zorn's wife Emma. Thegerström is primarily to be regarded as a landscape painter and he painted motifs taken from Djursholm and Särö. He painted portraits, but can also be considered a graphic artist. He is represented at the National Museum and Waldemarsudde in Stockholm as well as at other Swedish museums.