Jacknife Lee is a music producer from Ireland who has worked with U2 , R.E.M. , Snow Patrol and Bloc Party . Garret `` Jacknife '' Lee is an Irish music producer and mixer . He has worked with a variety of artists , including U2 , R.E.M. , Snow Patrol , Bloc Party , AFI , The Hives , Weezer , Vega4 and Editors .