Robert Siers Cavallo (born March 21, 1963) is an American record producer, musician, and record industry executive. Primarily known for his production work with Green Day, he has also worked with Linkin Park, My Chemical Romance, Eric Clapton, the Goo Goo Dolls, the Dave Matthews Band, Kid Rock, Jawbreaker, Alanis Morissette, Black Sabbath, Phil Collins, Paramore, Sixpence None the Richer, Lil Peep, Shinedown, and Meat Loaf. He is also a multiple Grammy Award winner.
Cavallo plays multiple instruments and has professional credits for his bass, keyboard, organ, piano, guitar and percussion work.