Finnish painter. He studied at the School of Drawing in Turku from 1869 to 1878. In 1878 he travelled to Dosseldorf and enrolled at the Kunstakademie, where he attended classes on landscape painting by Eugen Docker until 1886. He spent his summers in Finland, on the aland Islands, preparing sketches that provided the groundwork for many of the paintings he produced in Dosseldorf. Although Westerholm began working according to the principles of studio painting, his vivid studies are often imbued with the crispness of the plein-air style. In the early 1880s he concentrated on painting autumnal scenes and rapidly became the leading landscape artist of the younger generation with such works as the Mail-packet Jetty at Ecker (1885; Hemeenlinna, A. Mus.).