Isengart was born in Germany and raised in Paris and Munich. Inspired by Bob Fosse's Cabaret he created and directed his first cabaret variety show at age 13 in German High school and has ever since been dedicated to this particularly cosmopolitan form of live entertainment.
In New York, he became a spokesperson and specialist in Weimar cabaret songs, particularly from the pens of Kurt Weill and Bertolt Brecht, whose entire collaborative repertoire is part of his performance portfolio, including a legally challenged chamber version of the duo's seminal "Seven Deadly Sins" in which he sings every single part. Isengart is known to always perform any foreign language songs at least partially in his own English translations to make them accessible for his American audiences.
His affinity to the French chanson and fluency in the French language has also made him particularly adept at interpreting the songs of, among others, Jaques Brel, Edith Piaf, Leo Ferré, Juliette Greco, Dalida, and the legendary Barbara, whose songs he recorded for his first EP, Isengart chante Barbara (currently out of print).
His most recent collaboration brought him together with Canadian opera star Measha Brueggergosman and conductor Edwin Outwater for an evening of Kurt Weill music presented by the Waterloo Kitchener Symphony Orchestra.
Isengart resides in New York with his partner, performance artist and creator of the Homeless Museum of Art, Filip Noterdaeme.