Born in Warsaw, he is a composer and teacher, son of the composer Ryszard Sielicki. From 1975 to 1980 he studied composition with Andrzej Dobrowolski and Włodzimierz Kotoński at  the Chopin Academy of Music in Warsaw. In 1984, on a Dutch  government scholarship, he continued his studies—including  electronic music—with Ton de Leeuw at the Sweelinck Conservatorium in Amsterdam. He twice took part in the International  Composition Workshops in Amsterdam, in 1984 and 1988, and  also attended the International Summer Courses for New Music  in Darmstadt in 1986 and a Centre Acanthes summer course in  Villeneuve-lès-Avignon in 1991, as well as a number of courses  and workshops in Poland.

His awards include prizes and distinctions at the Polish Composers’ Union’s Young Composers’ Competition, the Warsaw  Branch Competition of the same Union, Concours de Genève,  and CIME in Bourges. Many of his works have been recorded  by Polish Radio and issued on disc, and have been performed at  festivals such as Warsaw Autumn, Poznań Music Spring, Warsaw  Music Encounters, and many others.

Music for children and young people forms an important thread  of Sielicki’s work. In 1994, WSiP published Jakie to łatwe! czyli  nowy sposób uczenia śpiewu wielogłosowego (How Easy It Is! A New  Approach to Teaching Part-Singing), coauthored with Ewa Marchwic ka and containing more than two 200 pieces written specifically for children. He has also received commissions for young  performers from the Do-Re-Mi Festival in Łódź and the orchestra  of the Fryderyk Chopin State Music Schools Complex in Warsaw. A frequent recipient of composition scholarships from the Ministry of Culture and the Arts, Sielicki received the Stanisław  Wy spiań ski Young Artists’ Award, 2nd Class, in 1989 for achievements in composition. Polish Contemporary Choral Music, which  includes his 1994 a cappella psalm Jubilate Deo, was nominated  for the 2001 Fryderyk Award for Vocal Music Album of the Year. Teaching has run alongside his work as a composer since 1982.  From 1982 to 1987 he taught at the Karol Szymanowski State Secondary Music School in Warsaw, and later for more than a decade  at the Fryderyk Chopin State Music Schools Complex. He has  also devised his own music curricula. Since 1987 he has taught  at the Chopin University of Music, where he is now a professor.  From 2009 to 2013 he was Deputy Dean of the Faculty of Composition, Conducting and Music Theory, and he subsequently headed the University’s New Music Studio. In 1992–93 he taught  at the Université d’Été in Marly-le-Roi near Paris; over a number  of years, he also taught composition at Keimyung University in  Daegu, South Korea.

Selected works: Memorabilia, concertante fantasy for bandoneon and string orchestra (2015), Chopin’s Crumb in a Cage  for two pianos and percussion (2015), North Mazovian Mazurkas for flute, violin, cello and accordion (2015, rev. for flute,  violin, viola, and piano, 2016, rev. for violin, viola, cello, and  piano, 2017), Images from Warsaw: the Palace of Culture, electroacoustic work (2016), At the Margin (after Paul Klee)for bass  clarinet and tape (2016), Mokotów Electronic Mazurka (2016),  Micrologus II for accordion, string orchestra and harpsichord  (2016), Micro Strategy (With Shadow of Chopin) for piano and  live electronics (2016), Little Electronic Orphans (In Memory of  Eugeniusz Rudnik), electronic music (2016), Shadow Play I – Distorted Noises for tape and video (2016), Seven Simple Mazurkas  for string orchestra (2016), Secondo Concerto per archi Hortus  Conclusus for string orchestra (2016–17), Clay Tablets for percussion and string orchestra (2017), Galyzianer Rhapsody for clarinet  and string quartet (2017), Sonata “Per fas et nefas,” version II, for  two violas (2017), MicroSonata for eight violas (2017), Hommage  à Szymanowski for violin and cello (2017), Sarang for violin, cello,  and piano (2017), Missa Brevis Coreana – Kyrie and Gloria for  choir and piano / organ (2017)/ Aphorisiade – Puzzle Opera, children’s opera (collective composition, 2018), Basements. Mysteries  from under the floor, audio-drama opera for voices, electronics,  animations and Polish Sign Language (2020).