Original: Gurewitz rejoined in 2001, making Bad Religion a six-piece band, and contributed to their four most recent albums (the last being 2010's The Dissent of Man).
Simplified: Brett Gurewitz came back in 2001, and worked with them on their three most recent albums. The band has may create another album in 2010, enntitled The Dissent of Man, and will also mark the first time that a Bad Religion line-up had not changed in four consecutive studio recordings.