Gregory Allen "Greg" Kurstin (born May 14, 1969) is an American record producer, musician and songwriter. Described as "the consummate DIY writer and producer", Kurstin has been associated with releases which have cumulatively sold more than 60 million albums worldwide. He has been nominated for 10 Grammy Awards, including Producer of the Year in 2010 and 2014. In addition to three other Grammys, Kurstin won Producer of the Year (Non-Classical) in 2017.
Kurstin co-wrote, produced and played most of the instruments on the record-breaking 2015 Adele single, "Hello". Among others, he has worked with Sia, Beck, Kelly Clarkson, Ellie Goulding, Pink, the Shins, Tegan and Sara, Lily Allen, and the Foo Fighters. He often plays guitar, bass, keyboards and drums, and engineers and programs the records he produces.