Brian Aubrey Marshall is an American musician and songwriter best known as the bassist and co-founder of the rock bands Creed and Alter Bridge.

Creed is an American rock band from Tallahassee, Florida formed in 1994. Creed was prominent in the post-grunge movement of the late 1990s and early 2000s, releasing three consecutive multi-platinum albums; their second, Human Clay (1999) received diamond certification by the Recording Industry Association of America (RIAA). Creed has sold over 28 million records in the United States, has sold over 53 million albums worldwide, and was the ninth best-selling musical act of the 2000s.