Rowland Constantine O'Malley "Rollo" Armstrong (29 April 1966) is an English music producer and multi-instrumentalist. He is half of the remix team Rollo and Sister Bliss and is a founding member of the electronic music group Faithless. He has provided remixes for U2, Moby, Grace, Rob Dougan etc.
Armstrong was born to an Irish publisher and English poet. His younger sister is singer Dido, whom he helped to write and produce her multi-million selling albums No Angel, Life for Rent and Safe Trip Home. He studied at the University of York and was an active member of the student radio station, URY.
Armstrong has appeared on a large number of music projects, both within groups and solo, using various monikers, including Faithless (which he formed in 1995 with Sister Bliss, Jamie Catto and Maxi Jazz), Rollo Goes …, Our Tribe (with Rob Dougan), and Dusted.
In 1991, Rollo founded Cheeky Records. At a later date Champion Records stepped in to help with funding and advice (it has since been bought out by BMG). In 1992, Rollo co-wrote and co-produced Felix's hit single "Don't You Want Me", which reached number 1 in Finland, Italy, Spain and Switzerland, as well as reaching number 6 on the UK Singles Chart.
In the United States, Rollo is known for his production work on Dido's albums as well as singer/songwriter Kristine W's debut album, Land of the Living.