Bryan Kei Mantia (born February 4, 1963), known professionally as Brain, is an American rock drummer. He has played with bands such as Primus, Guns N' Roses, Praxis, and Godflesh, and with other performers such as Tom Waits, Serj Tankian, Bill Laswell, Bootsy Collins, and Buckethead. He has also done session work for numerous artists and bands.
