Sean Beavan is a musician, record producer, and audio engineer best known for his work with Marilyn Manson, Nine Inch Nails, God Lives Underwater, and Slayer. His production style is typically heavy, with heavily saturated guitars, but his work is diverse and wide ranging as exemplified by bands like No Doubt and System of a Down, to indie bands like Thrice, and 8mm.

Beavan started his career as a musician and engineer in his hometown of Cleveland, Ohio. He played bass and sang in various local bands and also played fretless bass with Clevelander Eric Carmen (of The Raspberries) on the song "Hungry Eyes" on the Dirty Dancing Soundtrack. While working as an engineer at The Right Track Studio in downtown Cleveland, Beavan met Trent Reznor who worked as the in-house programmer. Reznor also played keyboards in several local bands that Beavan mixed.

Reznor asked Beavan to mix the demos of what would eventually become Pretty Hate Machine, which had received multiple offers for record deals. Beavan mixed sound during Nine Inch Nails' live concerts for many years, eventually becoming an unofficial member of the live band, and even singing live backup vocals from his place at the mixing console. Reznor invited him to work on The Downward Spiral as well as mix several songs on Marilyn Manson's debut record Portrait of an American Family. After contributing to several Nine Inch Nails remix releases (including Closer to God), Beavan mixed and co-produced Marilyn Manson's Antichrist Superstar.

In 1996, after 8 years, Beavan left the Nine Inch Nails camp to mix front of house for the "Antichrist Superstar" world tour. In late 1997 Beavan and Manson moved into the Hollywood Hills and started production on Mechanical Animals.

Beavan went on to produce and mix records for artists as diverse as Guns N' Roses, God Lives Underwater, System of a Down, Depeche Mode, No Doubt, Slayer, Kill Hannah, HYDE, P.O.D., Paloalto, Thrice, Unwritten Law, MOTH, Kidneythieves, Tommy Stinson, Tiger Lou, Norway's Jazz metal juggernaut Shining, Hypernova, Chronic Future, Meese, and Long Island's Envy on the Coast. He also returned to work with Manson, mixing Eat Me, Drink Me, and co-producing and Mixing The High End of Low.