From the early 2000s onwards, Romberg's career as a composer, writer and music publisher took him on a dynamic path, both nationally and internationally.
[4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] In July 2015, Romberg’s 60 min orchestral work Homériade closed the world’s largest performing arts festival in Avignon, France, to general recognition.
Romberg's music has been associated with the neo-romantic current of composers in his generation in Scandinavia equally found in the works by Ola Gjeilo, Marcus Paus, Kim André Arnesen and others.
[22] In 2015 his one and a half hour long oratorio Homériade based on the mythic texts by the contemporary Greek poet Dimitris Dimitriadis, featuring Robin Renucci and the Orchestre régional Avignon-Provence, closed the 69th Avignon Festival.
As a conductor he has worked with London Session Orchestra recording his own albums "Norse Mysteries" and "Scandi Drama" at Abbey Road Studios.