Gregory Allen "Greg" Kurstin (born May 14, 1969) is an American record producer, songwriter and multi-instrumentalist. 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 six Grammy Awards and a Golden Globe and has won three Ivor Novello Awards. 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 and Lily Allen. He often plays guitar, bass, keyboards and drums, and engineers and programs the records he produces. An "exceptionally accomplished" musician, Kurstin began his career as a jazz pianist and later co-founded Geggy Tah. He has collaborated with Inara George in The Bird and the Bee since 2004.