Rob Mosby played drums in Gwar. He joined the band in 1987 to replace Jim Thompson. Mosby was featured on Gwar's 1988 album "Hell-o".
Mosby was followed up by Pete Luchter. The latter did not stay long and left the same year. Jim Thompson temporarily rejoined. Soon after Brad Roberts, better known as Jizmak Da Jusha, joined the band as their permanent drummer.