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