Neumann received the audience award with the Quartet of Oddvar Paulsen at the Norwegian Championship in amateur jazz the same year, and from then on he became professional musician.

[1] Neumann was early well recognized in the octet of Fred Nøddelund that contributed to the concert series at the Munch Museum arranged by Norsk jazzforum in 1968, and later as the leader of his own "Newman and the New Men".

[4] Neumann played in the bands of Espen Rud, like "Kråbøl", and toured with the traditional Norwegian folk musicians Nils Økland and Bjørnar Andresen in 1985.

After 13 years of musical silence, he became the lead figure of "The Quintet", with the debut of the jazz club "Blå" in 1998, followed by festival engagements at Vossajazz and Moldejazz in 1999 and in Oslo 2000.

From 2000, he has lived a quieter life in Risør, but has collaborated on the albums Lost Animals (2009) with Vidar Johansen Quartet and To someone I knew (2013) by Erik Wesseltoft.