Regularly performing in major Swedish venues, he has appeared internationally in venues including Concertgebouw Amsterdam, Prinzregententheater and Gasteig Munich, Tokyo Bunka Kaikan, Seoul Art Center and Brucknerhaus Linz. He has worked as a soloist with orchestras such as London Philharmonic Orchestra (UK), Swedish Radio Orchestra, Gävle Symphony Orchestra (Sweden), Querétaro Philharmonic Orchestra (Mexiko) and Incheon Philharmonic Orchestra (South Korea).
Equally in demand as a chamber musician, he regularly performs with string players and singers all over Europe and have made critically acclaimed appearances and tours in Germany, France, The Netherlands, Czech Republic, China, Japan and South Korea.
With an extensive repertoire that often features his own transcriptions, he constantly searches for new expressive possibilities for the guitar. Close collaborations with numerous composers including Sofia Gubaidulina, Jose M. Sanchez-Verdu, Francisco Coll, Jersper Nordin and Benjamin Staern has resulted in numerous works and concertos written directly for him. He has premiered new guitar concertos with major Scandinavian new music ensembles BIT20 Bergen and Norrbotten NEO. Jacob Kellermann is also a member and co-founder of the Dutch-based New European Ensemble.