Personeel
Rebecca Huber
artistiek directeur, viool
Rebecca Huber is a violinist whose work spans performance practices from the baroque era to the present day. She serves as Artistic Director of Heliosfero and teaches string quartet studies at the Royal Conservatory of The Hague.
An active performer across Europe and the Americas, Rebecca collaborates with leading chamber ensembles and orchestras including B’Rock and Anima Eterna (Belgium), and has recorded three albums with the Richter Ensemble for the Passacaille label. Her international engagements include performances with Teatro Nuovo, Cepromusic, and the AMA Orchestra of the National University of Mexico.
Rebecca is committed to music education and artistic development, teaching career-development courses and co-designing a new program on communication in the music sector through the INTUNE European collaboration. She holds two research grants at the Royal Conservatory of The Hague through the faculty lectorate program, focusing on 19th-century repertoire, and in 2026 was awarded a Trotter Grant to give lessons and concerts at the University of Oregon in 2027.
Janco Verduin
Composer, visual artist, programmer
In his music, Janco Verduin (b. 1972) draws from a vast range of sources: software engineering, neuroscience and psychology, nature, physics and biology, visual art, and of course the full breadth of musical tradition. Through ever-changing sound constellations, he explores human perception — the structures we hear and the meaning we give to them.
After studies in Industrial Product Design and Music Technology, and a brief career as a 3D software engineer, Verduin studied composition at the Royal Conservatory of The Hague with Louis Andriessen, Martijn Padding, Gillius van Bergeijk, and Richard Ayres. Since completing his Master’s degree in 2009, he has worked as a freelance composer. He also paints abstracts and creates computer animations as visual companions to his music.
Verduin has written works for Ensemble Modelo62, Nieuw Amsterdams Peil, Orkest de Ereprijs, Calefax Reed Quintet, the David Kweksilber Big Band, SPECTRA Ensemble, Nieuw Ensemble, ASKO Ensemble, Cantus Ansambl, and the Dutch Student Orchestra, among others. His music is performed regularly in the Netherlands and internationally, at festivals including the Gaudeamus International Muziekweek, Iordens Viooldagen, November Music, and the NTR Zaterdagmatinee.
Josje Calff
projectleider
Josje Calff works as a volunteer for Heliosfero. Josje Calff brings extensive administrative, organizational, and financial expertise to her role as volunteer project leader at Heliosfero. She is the retired director of the University Library of the Vrije Universiteit Amsterdam, and since her retirement in 2017 has been active in the business and production support of professional musicians, including Combattimento Consort Amsterdam, Maarten Engeltjes, and PRJCT Amsterdam.
An amateur bassoonist herself, Josje maintains an active interest in the cultural sector through ongoing training in arts entrepreneurship, including the VSB Fundraising course and workshops with Platform Cultureel Avonturiers.