Tomas Leonhardt was born in Buenos Aires, Argentina. In 2002 he finished his studies in Composition and Conducting at the Universidad Católica Argentina. That same year he moved to Vienna, Austria, where he furthered his studies in Media and Film Composition at the University of Music and Performing Arts.

He has composed and produced scores for various film and TV productions in Austria (ORF), Germany (3Sat, ARTE, ZDF), England, the United States, Brazil and Argentina.