After Cake, he joined Deathray, a band where he provided backing vocals and lead guitar. He also wrote four songs and co-penned two more for their 2000 debut album, which was released on Capricorn Records and then re-released on Doppler Records. Most recently, he played piano and guitar and co-produced Puckett's Versus the Country Boy, a 2003 EP by Matt Sharp, formerly of Weezer and The Rentals. Deathray recorded their 2nd album (Believe Me) in late 2004 and early 2005 in which Brown played guitar, did backing vocals, and other instruments on. "Believe Me" was released via download later in 2005 and a few copies were available on CD format despite not being signed on any label. He also co-produced the debut album from Golden Shoulders with Deathray bandmate Victor Damiani, and recently played guitar on Friendship is Deep, the second album from Golden Shoulders. Greg played guitar on "Bound Away" from Cake's 2011 album, Showroom of Compassion, which was the first appearance of him on a Cake album since 1996's Fashion Nugget.