Atticus Matthew Cowper Ross (born 16 January 1968) is an English musician, composer, record producer, and audio engineer.

[6] Ross came to notice in the mid-1990s as a synthesizer programmer for Tim Simenon's Bomb the Bass during the period of the albums Unknown Territory and Clear.

He programmed The Negro Inside Me and Oedipus Schmoedipus, and produced As Above So Below before forming his own band, 12 Rounds, with his wife Claudia Sarne and Adam Holden.

He has been credited as a producer and/or programmer on the Nine Inch Nails albums With Teeth, Year Zero, Ghosts I–IV (on which he was a co-writer), The Slip, and Hesitation Marks.

Other work has included two co-productions with Joe Barresi, the Loverman EP Human Nurture and Coheed and Cambria's Year of the Black Rainbow, as well as albums for Korn.

In May 2010, he appeared in a cryptic video[8] and was named as a member of a secret project,[9] later revealed to be How to Destroy Angels, a collaboration between Reznor and his wife Mariqueen Maandig.

In 2016, Ross and Reznor, along with composer Gustavo Santaolalla and the band Mogwai, collaborated to create the score to the documentary film Before the Flood.

[17] In June 2017, Ross, along with Reznor, Maandig, Robin Finck, Joey Castillo, and Alessandro Cortini, appeared as "The Nine Inch Nails" in Episode 8 of Twin Peaks: The Return on Showtime, performing an alternative live rendition of the song "She's Gone Away" which previously appeared on Nine Inch Nails' 2016 EP Not the Actual Events.