Reuben Jelleyman is a New Zealand composer based in Paris, after completing a Masters degree in composition under Gérard Pesson at CNSMDP. His works have been played by ensembles such as Ensemble Intercontemporain, Multilatérale (France), Avanti! (Finland), Schallfeld (Austria), Ensemble Fractales (Belgium), Stroma (NZ), NZTrio, the New Zealand Symphony Orchestra, and the NZSO National Youth Orchestra, along with numerous soloists. Concerts have included monographic portraits dedicated to his music in Vienna, Auckland, and Wellington. His work has been recognised at a national level including the CANZ (Composers Association New Zealand) Trust Fund Award 2019 for contributions to New Zealand contemporary music, and has been the recipient of numerous project commissions, including four Creative New Zealand grants.

His music has been recorded numerous times for RNZ, as well as commercially, including Andrew Beer and Sarah Watkins for their Aotearoa Music Award-winning album 11 Frames. Reuben is one of the most professionally developed and internationally recognised young NZ composers, and remains the youngest person to have received a prestigious nomination for the SOUNZ Contemporary Award 2015 in the history of the award. He has been nominated for a second time in 2021.

Reuben graduated from Te Kōkī New Zealand School of Music / Victoria University of Wellington in music and physics, completing his bachelor composition studies under Michael Norris and Dugal McKinnon. He has also received tuition from Yan Maresz, Luis Naon, and Grégoire Lorieux in electronic music at CNSMDP, and from composers such as Salvatore Sciarrino, Beat Furrer, Tristan Murail, Francesco Filidei, and Jukka Tiensuu at various international masterclasses.

His works also include multimedia installation and multichannel electronic works, as well as performing as a percussionist, organist, and conductor. Jelleyman is the creator and director of PORTALS, a music project in Wellington city hosting contemporary music events in various alternative concert settings.

He is supported by an APRA Professional Development Award, the Edwin Carr Fondation, Legs Jabès, Nguyen Thien Dao, Fondation de France, Mécénat Musical Société Générale, Dame Malvina Major, and Winifred Owen scholarships to continue his studies. In 2021 Jelleyman was named recipient of a New Zealand Arts Foundation Springboard award for career development.