Koen Heldens is a Dutch born[1] mix engineer[2] residing in Miami Florida. Koen started his career in 2003 and rose to prominence in 2017 when he started working with the late XXXTentacion[3] with which he earned a Guinness World Records for most streamed song in a single day for the Billboard Hot 100 #1 single Sad!.[4][5] Heldens has been nominated for a Grammy Award[6] and has won an American Music Award[7] and a Billboard Music Award.[8] Heldens has worked with Kanye West, Maluma, Trippie Redd, Swae Lee, Khea, Lit Killah, Dalex, Don Toliver, Lil Wayne, Rick Ross, Tory Lanez, Kid Ink, Elley Duhé, Lil Pump, Lil Yachty, Rico Nasty, Vybz Kartel, Ky-Mani Marley, Stefflon Don and Ski Mask The Slump God.[9][10]