Mangini had left his tenured teaching position at Berklee College of Music to join Avenged Sevenfold .
When Avenged Sevenfold later decided to also sever ties with Portnoy , he announced that he had asked to return to Dream Theater , but was turned down by their lawyer since the band had already brought Mangini on board , and Mangini had left his tenured teaching position at Berklee College of Music to join the band.
Mike Portnoy