​​Besides his own quartet, Gert-Jan Dreessen is active as a sideman and invited musician in a wide range of projects across contemporary jazz, composed music and improvisation.
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He is regularly invited by artists and ensembles for his strong sense of time, sound, interaction and form, moving naturally between written material, open improvisation, groove-based music and large ensemble work. His work has brought him to clubs, festivals and concert halls across Europe, the United States, Canada, Mexico and South Africa.
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Main project
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Gert-Jan Dreessen Quartet
Original music with Jean-Paul Estiévenart, Bram De Looze and Cyrille Obermüller.
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As sideman / invited musician
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Flat Earth Society Orchestra (FES)
Large ensemble work, international touring and co-composition.
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Orson Claeys — Othello
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Attilio Sepe Group
 
Stefan Bracaval — Zilt
 
Cedric De Lat Quintet
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Thomas Decock Group
 
Tomer Cohen Trio / Quartet feat. Shai Maestro
 
Karel Cuelenaere Trio (KCTIII)
 
Jeroen Reggers Quartet
 
Stijn Kuppens — Dialogues
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Ping O.D. feat. John O’Gallagher
 
FONS. feat. Logan Richardson
 
Original / compositional work
Gert-Jan Dreessen — Dimensions (2023)
Suite originally composed for jazz quintet and string quartet.
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Gert-Jan Dreessen — Between Motion and Stillness (2025)
Suite and solo project commissioned by ZOG Genk.
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Selected freelance collaborations
As a freelance drummer, Gert-Jan Dreessen has performed and collaborated with artists including Jacky Terrasson, Rotem Sivan, Nduduzo Makhathini, Jef Neve, Bert Joris, Logan Richardson, Jakob Bro, Michel Hatzigeorgiou, Nic Thys, Joshua Redman, Shai Maestro, Frank Vaganée, Bart Defoort, Nathan Wouters, Wajdi Riahi, Laurent David, Max Light, Kris Monson, Pablo Menares, Sam Gerstmans and Helena Casella.​