 Lewis got her undergraduate degree in Vocal Performance at the Missouri State University, and the graduated degree at the University of Kansas.On September 11, 2011, Christofer Johnsson, Therion's head, announced that Lewis was named permanent member of the band, becoming then the first female member to have permanent status in the history of the band.As a permanent member of Therion, Lori participated in the recording of "Les Fleurs du Mal", dedicated to the 25th anniversary of the band.