Thor Eisentrager is a founding member and former guitarist for the Minneapolis-based Noise rock outfit Cows. After the release of the Cows's ninth album, Sorry in Pig Minor, Thor announced that he had grown tired of touring and left the band. The remaining members disbanded shortly thereafter. Nowadays, he is retired from the music business and works as the assistant director of security for the Minneapolis Institute of Arts.
His approach to guitar playing has been noted as adding greatly to the band's diverse sound, his unique style being described as sounding as if he "played with metal files". Unlike the other members of the Cows, Thor was mostly influenced by the Blues, favoring such artists as Muddy Waters and The Rolling Stones. He was also known to bring hand-written notation into band practice.