Born in 1972 in Szczebrzeszyn, Poland, he is a Polish-Australian composer living in Perth, Australia. In his writing, he focuses mainly on chamber works for small numbers of instruments, as he creates his music through close collaborations with distinct performers - experts in new music. the fundamental objective in his work is an in-depth exploration of the physicality of producing sound, where the instrument-player relationship is the primary source of the musical substance. Soloists and ensembles who have commissioned and performed Karski's works include American autist Carlton Vickers, Polish duo Flute HO'Clock, Swedish violinist Karin Hellqvist, Gośka Isphording's ensemble the Roentgen Connection, and Swedish contrabass Paetzold recorder soloist Anna Petrini, among many others. His music has been receiving international exposure through performances at leading festivals such as Warsaw Autumn, Huddersfield, and Gaudeamus Music Week in Amsterdam. His works have been released on CDs in Australia, Canada, Austria, Britain, Sweden, and Poland. Of particular importance is the composer's monographic album with his flute works recorded by Flute O'Clock and released by Bôłt Records in Poland in 2016.
Selected works: Les éruptions du rêve for 15 musicians (1999- 2000), Beginnings To No End for percussion (1999), Matter of Perspective for offstage piccolo / amplified bass flute, bass clarinet, piano, violin and cello (2000), reads of Fate for violin, violoncello and piano (2001), Streams of Consciousness for viola and cello (2000), Glimmer for alto flute and bass flute (2002), Inner Stream II for vibraphone and piano (2002), Streams Within for 14 musicians (2003), Streamforms for amplified bass flute (2003), Open Cluster M45 for bass flute (2003), motion+form for percussion, harp, and double bass (2003), Streamforms II for amplified cello (2004), Inward for piccolo flute, bass clarinet, and piano (2004), the Impulse Within for percussion and string quartet (2004), (e) motion of forms for solo violin (2005), To Remain in Change for flute and cello (2005), OverFlow for oboe, trumpet, trombone and percussion (2006), RiverBed for flute, guitar, harp and violin (2006), the Source Within for piano solo and three instrumental groups (2006), the Outward Impulse for contrabass clarinet and tam-tam (2007), entangled for trombone and cello (2007), Gates of the Irrational for bass-baritone and piano (2007), fragile for two clarinets (2008), Oscillations of Presence for bass clarinet and contrabass clarinet (2008), preseed for flutes and ensemble (2009), 112 Iphigenia for amplified flute (2009), Superb Imposition for amplified Paetzold contrabass recorder (2010), In Search of Certainty for string quartet (2010), Certainty's Extent for cello (2011-13), Veiled Voice for flute (2012), Certainty's Flux for violin (2013), Veiled Words for two alto flutes and two tam-tams (2013), Streampulses for harpsichord (2014), The Unsearchable for piccolo flute / flute, percussion, and harpsichord (2014), Streamforms III for flute, alto flute, and harp (2015), Metaphysical Graffitti for amplified prepared accordion (2016), The Unquenchable for amplified alto flute (2016), Stream forms IV for percussion (2017).