Olivier J. L. Heldens (born 1 February 1995), commonly known as 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 as “Gecko (Overdrive)”. He is regarded as a pioneer of the future house genre propelling it to international attention and numerous chart successes with “Gecko (Overdrive)” and ”Last All Night (Koala)”.

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 latter two on his own label Heldeep Records.