Mike Portnoy formed Adrenaline Mob after leaving Dream Theater.
Michael Stephen `` Mike '' Portnoy ( born April 20 , 1967 ) is an American drummer primarily known as the former drummer , backing vocalist , and a co-founder of the progressive metal/rock band Dream Theater . The first , Adrenaline Mob , a traditional heavy metal/hard rock band with singer Russell Allen ( of Symphony X ) and guitarist Mike Orlando .