Lumpert began his professional training at age 19 at the Bruckner Conservatory in Linz, Austria, where he studied with Doug Hammond and Harry Sokal.

During this period, he was a member of Munich-based band Sidewinders, winner of the "Best Jazz Group of Germany" award.

Lumpert's music represents a unique fusion of jazz, funk, Eastern European rhythms, and modern neo-bop sketches.

He has performed with jazz legends including Reggie Workman, John Abercrombie, Chico Hamilton, Sonny Simmons, Boris Kozlov, and Andy McKee.

Lumpert has performed at jazz festivals in Munich, Ljubljana, Novi Sad, the Cankar Centre in Ljubljana, at major jazz clubs in New York including the Jazz Standard, Cornelia Street Cafe, Supper Club, and Birdland and venues in Vienna, Munich, Linz, Zagreb, Belgrade, Sarajevo, Novi Sad, Athens, Crete, Venice, and Hungary.