After establishing himself as one of the exponents of Regietheater, Flimm was called to manage renowned theaters and festivals.
His operatic productions in Germany led to an international career, with operas staged in the Netherlands, Austria, Switzerland, England, Italy, and the United States.
He was a German theater and opera director, and theater manager.
Flimm was professor at the University of Hamburg and was a member of the Academies of Arts in Hamburg, Munich, Berlin and Frankfurt.