Lenz was a founding member of the Vienna Secession; during his career's most important period, he was a Symbolist, but later his work became increasingly naturalistic.
A member of the Vienna Künstlerhaus spent the early 1890s in South America, designing banknotes in Buenos Aires.
[1] In 1897, Lenz left the Künstlerhaus to become a founding member of the Vienna Secession,[2] and his work for the group's first exhibition was hailed as "outstanding".
[12] However, a foray, together with various other Secession artists, into woodcuts for the Beethoven exhibition catalogue was panned as "rough" and more like the work of an amateur than an experienced painter, albeit enthusiastic and not totally without merit.
[25] His 1913 painting A Song of Spring was influenced by the dancer Isadora Duncan's 1904 stay in Vienna, sharing her symbolic themes of cyclic renewal and rebirth and featuring mediaeval costume.