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 together with orchestras such as London Philharmonic Orchestra (UK), Swedish Radio Symphony Orchestra, Gävle Symphony Orchestra (Sweden), Querétaro Philharmonic Orchestra (Mexiko), and Incheon Philharmonic Orchestra (South Korea).

Engagements during the 21/22 season include solo appearances with Orquesta de Valencia (Spain) Norrbotten NEO and Israel Contemporary Players.

Equally, in demand as a chamber musician, he regularly performs with string players and singers all over Europe and has 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, Jesper Nordin, and Benjamin Stern have resulted in numerous works and concertos written directly for him. Future commissions include Toshio Hosokawa, Francisco Coll, and Lotta Wennäkoski.

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.

Kellermann has previously recorded two critically acclaimed albums for BIS records (S. Gubaidulina “Repentance” – 2014 and Schubert Sonatas - 2018). His third album, focusing on Spanish guitar concertos, was released on the same label in December 2020 to much critical acclaim. 

“A distinctive new year release, featuring the guitarist Jacob Kellermann... I leaped for joy at the heat radiating from Rodrigo´s Concierto de Aranjuez, very smartly accompanied by the London Philharmonic Orchestra”  - Geoff Brown, The Times (UK)

“Clear, tíght orchestral sound, excellently performed guitar part prominent in the mix. It is the clever context that makes the CD so good.” Joep Stapel, NRC Handelsblad (The Netherlands)

The album was also chosen by Sweden's largest daily newspaper Dagens Nyheter, as the #1 best classical Album of 2020. The CD presents Rodrigo's famous Concerto de Aranjuez together with London Philharmonic Orchestra as well as new concertos dedicated to him. 

Jacob Kellermann has studied in Sweden, Spain, the Netherlands, and Germany. He received his "Meisterklasse Diplom" under prof. Franz Halasz at the Hochschule für Musik in Munich in 2011. He plays on an instrument by the German luthier Matthias Dammann.