He also assisted the Music Directors at the Semperoper in Dresden (1988) and at the Canadian Opera Company (1992).
From 1993 to 1999, Ringborg worked as staff conductor with the Freiburg Opera, where his position in 1997 was elevated to Deputy Music Director.
From 1997 to 2003, he conducted at the Aalto Theatre in Essen, where in 1999 he was appointed Principal Conductor.
[2] Ringborg made his debut at the Gothenburg Opera in 1998 with Tannhäuser, and later was named its Principal Guest Conductor.
There he also conducted the much acclaimed world premiere of Notorious by Hans Gefors in 2015.