Christopher Alan "Tricky" Stewart (born January 4, 1974) is an American songwriter, music producer, music publisher, executive producer, recording industry executive and recording studio owner. He is also a former president of A&R at Epic Records. In a career spanning over 20 years, Stewart, at the helm of his company RedZone Entertainment, is responsible for over 25 million records sold. He is noted for producing many hip hop, R&B and pop chart topping singles, such as Beyoncé's "Single Ladies (Put a Ring on It)", Britney Spears's "Me Against the Music", Mýa's "Case of the Ex", Rihanna's "Umbrella", Mary J. Blige's "Just Fine", Mariah Carey's "Touch My Body" and "Obsessed", Jesse McCartney's "Leavin'",Justin Bieber's "Baby", Ciara's "Ride",Nicole Scherzinger - Your Love and many others. 　　In 2012, he was included in Billboard's 40 Under 40, a list of music executives "who are propelling our industry with their artistic and business vision.