Flood (born 16 August 1960) is the professional pseudonym of British post-punk and alternative rock record producer and audio engineer Mark Ellis. Flood's list of work includes projects with recording acts like New Order, U2, Nine Inch Nails, Depeche Mode, Gary Numan, Ministry, Thirty Seconds to Mars, Erasure, Nick Cave and the Bad Seeds, PJ Harvey, A-Ha, Sigur Rós, The Smashing Pumpkins, The Killers, and Warpaint. His co-production collaborations have included projects with Brian Eno, Daniel Lanois, Steve Lillywhite, and longtime collaborator Alan Moulder, with whom he co-founded the Assault & Battery studio complex. In 2006, his work with U2 led to his sharing of the Grammy Award for Album of the Year for How to Dismantle an Atomic Bomb.