Daniel Gideon Mazer (born 4 October 1971) is a British screenwriter, producer, and comedian. Mazer is best known as the long-time writing and production partner of comedian Sacha Baron Cohen and worked with him on his three unorthodox characters Ali G, Borat, and Brüno. He also co-wrote and co-produced the films based on Baron Cohen's characters such as Ali G Indahouse, Borat, and Brüno.