Wikipedia article

Flood (born Mark Ellis) is another one of the Smashing Pumpkins' main producers, having worked on the incredibly suceessful "Mellon Collie and the Infinite Sadness", and also producing a few songs on "Machina: the Machines of God". However, he is most famous for his work with Nine Inch Nails and Trent Reznor, producing the most popular NIN album, "Downward Spiral", along with the "Broken" E.P., and some of "Pretty Hate Machine".