Mathias Johansen received his first rigorous musical and cellistic training with Ekkehard Hessenbruch. He began his academic studies with Prof. Wen-Sinn Yang in 2005, he then switched to Prof. Troels Svane in 2008. As of 2011, he is a master student with Frans Helmerson at the music conservatory "Hans Eisler" in Berlin. In 2014, he was admitted to the graduation exam with Prof. Conradin Brotbek at the Music Conservatory Stuttgart. His artistic development has been supplemented by master classes with David Geringas, Wolfgang Boettcher, Jens Peter Maintz, Daniel Müller-Schott, Gustav Rivinius, Wolfgang Emanuel Schmidt and Natalia Gutman.
Mathias performed as a soloist with the Lithuanian National Orchestra conducted by Gintaras Rikevicius, in addition to solistic performances with the Berliner Philharmonic. He also collaborated with such masters as Antje Weithaas, David Geringas, and Kalle Randalu for various chamber music projects.
His solo reportoire includes: Dvorák Cello Concerto, Shostakovitch Cello Concerto No. 1, Tchaikovsky Rococo Variations, Elgar Cello Concerto, the Haydn cello concertos in C and D, and Saint-Saens Cello Concerto No. 1.
He is also a much-in-demand chamber musician and performs regularly at various festivals, such as the Podium Festival Esslingen, Podium Festival Iceland, Chamber Music Festival Moteleon, Zeitkunstfestival, the Austrian Styria Chamber Music Festival, and the León Chamber Music Festival in Spain. In 2014, he was on tour in Japan and Norway. He is a member of the Berolina Ensemble and the Archos Quartet.
Beginning in Summer 2016 he will be professor at the "Landeskonservatorium Vorarlberg" (State Conservatory of Vorarlberg) in Feldkirch.