Bolier is an alias for for Dutch DJ & producer Leendert Wouter Bolier started in 2015. Other aliases include BLR, Inner Stories, Leon Bolier, LWB, Midnight Xpress, Precursor, Surpresa, The Boiler Room, West Of The Sun, and WSTLNDR.

Born 1980, started a producing career when he was 14 years old, after hearing the first commercial house tunes back then. Producing with some "cheapass" trackers he soon discovered how to build a track. Having had classical piano lessons when he was 8 years old, he developed some sense for melodies and melody lines. After hearing the anthem "Energy 52 - Café del Mar" he knew he would produce trance from then on. Nowadays he produces various styles including progressive, ambient and techno.