Born 1968 in Zürich, Nadja Sieger attended a Gymnasium in Zurich.

[2] In 2004 she featured in the Swiss television film Fremde im Paradies, 2005/2006 as co-author in a film not yet shown, as director in the independent theater scene and since 2005 from time to time as Jazz singer (Swing Time Dance ArchestrA, Big Band Connection and Swingtime Pocket Archestra).

In 2013 Nadja Sieger acted as voice actress in the Swiss-German animation film S'Chline Gspängst (The Little Ghost).

[6] In October 2014 Nadja Sieger was also involved as producer of the comedians Starbugs and director of their 2014/2015 tour.

[8] Ursus & Nadeschkin started in 1987 as street performers, and in 2002 they became the leading act and headline of the Swiss National Circus Knie, performing 257 times during the 2002 season tour and having an audience totaling one million spectators.