Claim: Rob Cavallo refuses to work with Eric Clapton.

Robert Siers `` Rob '' Cavallo -LRB- born March 21 , 1963 -RRB- is an American record producer , musician , and the CEO of Warner Bros. . Records . 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 , Alanis Morissette , Black Sabbath , Phil Collins , Paramore 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 .