Gustaf Theodor Wallén was born in Stockholm 14th December 1860.
Wallén studied at the Academy of Art under George von Rosen (1843-1923), a professor at the Academy from 1860-1908. In 1887 Wallén won a travel award which enabled him to study in Paris at the Academy Colarassi and, under William Bouguereau at the Academie Julian.
Wallén travelled widely in France, painting in Paris itself and in Brittany at Concarneau; he also travelled to Capri. In 1890 he received an honourable mention at the Salon, and in 1892 Wallén was awarded a Medal 3rd Class at the Salon des Artistes Françanis for a work which was subsequently acquired by the Musee d’Orsay.
On his return to Sweden Wallén continued to paint, in Skåne in Southern Sweden, and Stockholm before moving to Leksand, a small town in central Sweden.
Wallén was an artist of considerable renown achieving significant success in Paris and in Sweden. A painter of landscape, coastal scenes, portraits and sculpture, the National Gallery of Stockholm has ‘Yvonne, Jeune Fille Bretonne’ in its collection.
Wallén died in Leksand 15th January 1948.