In 1998, he was invited to the Aix-en-Provence Festival as Claudio Abbado's assistant conductor in Peter Brook's new "Don Giovanni" production.
Another one of his regular conducting mentors was Igor Golovchin, and Marius has also taken part in masterclasses with Kenneth Kiesler and Eri Klas.
Whilst resident at Helikon Opera, his performances included fully staged productions of Berg ("Lulu"), Bizet ("Carmen"), Giorgdano ("Siberia"), Poulenc ("Les Dialogue des Carmelites"), Prokofiev ("The Story of a Real Man"), Rimsky-Korsakov ("Kaschei the Immortal"), Shostakovich ("Lady Macbeth of the Mtensk District"), and works by Igor Stravinsky (such as "Mavra").
In 2007, Stravinsky was awarded the position of Chief Conductor & Artistic Director of the Karelia Philharmonic Orchestra,[2] and following his five-year tenure in this role, he then – at the personal invitation of Vladimir Jurowski – took up the position of Assistant Conductor of the London Philharmonic Orchestra for the 2013/2014 season.
During his tenure as Chief Conductor & Artistic Director, Stravinsky also released recordings of major works by Maurice Blower, Dorothy Howell, Joseph Holbrooke and Sergey Zhukov with the Karelia Philharmonic Orchestra.