Marcos Siega (born June 8, 1969 in New York City, New York) is a film, television, commercial, and music video director. He has also worked as a producer and a musician.

In the late 1980s he helped form the New York based punk band Bad Trip, releasing two full length records and numerous EPs. When he began directing music videos, many bands and musicians noted that Siega's background in rock music was beneficial. He has worked with bands such as Weezer, System of a Down, P.O.D., Papa Roach, Blink-182, The All-American Rejects and many more. His 2000 video for Blink-182's "All the Small Things" garnered him three MTV Video Music Award nominations and he was nominated for a Grammy Award for his Papa Roach video "Broken Home". In 2001 he signed with award winning commercial production company Hungryman Films and made his move into the spot world.

Siega has gone on to direct films and acclaimed television series such as Dexter, True Blood, Cold Case, and Veronica Mars to name but a few. He is co-executive producer of The Vampire Diaries and also directed the pilot and several subsequent episodes. Pretty Persuasion, the 2005 film he directed, was nominated for Grand Jury Prize at the Sundance Film Festival.

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