Olivier J. L. Heldens (born 1 February 1995), better known by his stage name Oliver Heldens, is a Dutch DJ and electronic music producer from Rotterdam. His 2013 song "Gecko" caught the attention of fellow Dutch DJ Tiësto, who signed him to his label, Musical Freedom, and released the track with vocals from British singer Becky Hill on 23 June 2014. Heldens also has a weekly podcast titled Heldeep Radio, which has been ongoing for over 2 years.
In 2015, he began producing bass house songs under the alias HI-LO, which comes from 'Oli H' in reversed form. Under his alias, Heldens has produced ten singles, including "Crank It Up", "Renegade Mastah" and "Wappy Flirt", releasing the later two on his label Heldeep Records. He is regarded as a pioneer of the future house genre alongside Tchami and Don Diablo.
Heldens began his professional music career when he signed to Spinnin' Records in 2013. His first releases on the label included the songs "Stinger" and "Thumper", which features DJ Jacob van Hage. Later collaborations included "Panther" with 'Robby East' which was released on the Oxygen label on 2 December 2013. The single "Gecko" was released in the same month on Tiesto's Musical Freedom record label. The song peaked at number 1 on the DMC Magazine Buzz Chart and was named "Essential New Tune" by BBC's Pete Tong on 31 January 2014.