Eric Peterson (born: 14 May 1964) is an American guitarist. He is best known as the only constant member of the US thrash metal band Testament. Eric has also formed a side-project black metal band called Dragonlord, in which he plays guitar and also sings. In Testament, Eric was originally a rhythm guitarist while Alex Skolnick handled all lead work. More recently though, on Testament's 2008 album The Formation of Damnation, Eric plays leads as well as Alex.