louis russell bell (born may 27, 1982) is an american record producer, vocal producer, songwriter, and mix engineer. bell's work includes collaborations with post malone, camila cabello, dj snake, steve angello, selena gomez, lorde and taylor swift. a producer and writer specializing in various genres, bell has 18 us top 10 hits to his credit, including seven number ones, all since 2018. "billboard" called bell's impact on the top of the charts "historic" and labeled him "pop's most prolific, accomplished and untethered freelancer of 2019".