Deen J. Castronovo (born August 17, 1964) is an American drummer and singer, best known for being a member of classic rock band Journey and hard rock acts Bad English and Hardline. He currently plays drums and shares lead vocals for the bands Generation Radio and the Revolution Saints. He has been a touring and studio member for Ozzy Osbourne, Steve Vai, Paul Rodgers, and Black Sabbath bassist Geezer Butler's GZR.