As composer his work incorporates several formats including instrumental acoustic, electroacoustic, acousmatic and multimedia. His pieces have been performed and premiered in Argentina, Brazil, Canada, Chile, Colombia, Denmark, England, Estonia, Finland, France, Italy, Poland, Peru, Spain, Sweden, Switzerland and Uruguay. As performer he experiences a constant activity as cellist of new music, free improvisation, improvised works with new technologies and collaborations with theatre performers, poetry and contemporary dance. Currently he lives in Helsinki where develops an active career as performer, composer, improviser, curator and educator. Since 2013 Castrillón has been working on his doctoral research at the University of Helsinki called NEW DIRECTIONS IN THE CELLO TIMBRE: Pieces for solo cello and cello with electronic media from the 20th and 21st century.