Mainly self-taught, Erik Magnussen originated from Denmark, where he developed his characteristic techniques and designs using naturalistic motifs.
Beginning his career at his uncle's gallery 'Winkel and Magnussen', he was influenced by H.C. Viggo-Hansen where he developed his chasing skills, and from the sculptor Stephan Sinding. One of his first major successes was the sale of his 'Grasshopper' brooch to the Museum of Decorative Art in 1907.